This article summarizes the changes for each version of the PreForm Insider Program, our early-access program that lets you see PreForm's latest features, experimental workflows, and cutting-edge algorithms before they hit the mainstream.

For information about public PreForm releases, see PreForm downloads and release notes.

The latest PreForm version can always be downloaded from the PreForm Insider Program download page.

PreForm Insider 3.65.0 build 1096 — October 28, 2026

This release improves and enhances the Layout and Pack tools, introduces support profiles and model edit search, and fixes a variety of bugs.

• New features:
  • Layout and pack across builds: When your models don't all fit in one build, Layout All and Pack All can move the overflow into other builds. Turn on the new multiple-builds option in the Layout or Pack flyout. PreForm fills the active build first, then existing builds that use the same print setting, and then adds new builds as needed. 
  • Support Profiles: Save a support Profile in the Supports flyout and reuse the same settings across PreForm sessions.
  • Search model edits: The model list search now also finds CAD-like edits (labels, holes, hollowing, and textures), so you can jump straight to a specific edit in a busy project.
• Improvements:
  • Faster support generation: Several steps of support generation run in parallel.
  • Delete key in CAD-like edits: Pressing Delete while a texture or hollowing edit is open removes only that edit instead of deleting the whole model. 
  • Auto-scroll when dragging files in: Dragging files from Finder or File Explorer into the model list scrolls the list when you reach its top or bottom edge.
  • Print settings table in Job Setup: Job Setup can list every available print setting in one sortable, filterable table instead of separate layer thickness and print setting steps. Turn it on in Preferences with Use the print settings table in Job Setup.
• Bug fixes:
  • Crash when grouping models: Fixed a crash when grouping models (Ctrl+G / Cmd+G), introduced with the faster large-scene graphics in the previous Insider build.
  • Overlap warnings after switching builds: After you switched builds, the Overlapping Models warning and outlines could disappear.
  • Flat walls missing bracing pillars: Fixed cases where support generation refused to add a bracing pillar next to a tall, unstable pillar on a flat wall, leaving the span unbraced.
  • Support auto-generate applied to every model: With support structure auto-generate on, editing support settings with no models selected regenerated supports on every model. It now only regenerates the selected models.
  • Unnecessary discard prompt in Manual Support mode: When manually editing a support structure auto-generate on, your edits are automatically applied, so leaving the manual support mode no longer asks you to discard them. Generate Structure also closes the flyout in this mode.
  • Auto-shrink with Layout and Pack: Fixed auto-shrunk models sometimes being placed next to the build instead of inside it, and made Layout and Pack correctly treat auto-shrunk models as fitting.
  • SLS model resize grew into the build floor: Resizing a model from the Scale flyout in an SLS scene grew it in all directions, so it could push through the bottom of the build volume. It now stays above the floor. 
  • What's New reappeared after visiting Dashboard: Switching to Dashboard and back no longer replays the startup dialogs. 
  • Cursor stuck as an arrow: Fixed an issue where the mouse cursor stayed as an arrow across the whole app, hiding resize and text cursors.
  • PreForm froze when the log file was in use: PreForm could freeze permanently when its log file reached the 20 MB rotation limit while another program (for example, a second PreForm window or a log viewer) had it open.
  • PreForm froze on quit: Fixed a freeze that could occur while quitting PreForm as it sent final usage data.

PreForm Insider 3.65.0 build 1063 — October 16, 2026

This release fixes a crash that happens when selecting Alpha Model Resin for Form Studio 1.

• Bug fixes:
  • Fixed a crash that occurred when selecting Alpha Model Resin V1 for Form Studio 1 in Job Setup. 

PreForm Insider 3.65.0 build 1047 — October 14, 2026

This Insider build adds Form Studio 1 and Nylon 11 Pro, denture presets in the Dental Workspace, and a model-overlap overlay. It also makes holes smoother, duplication faster, and graphics more responsive, as well as fixing a batch of support, project panel, Dashboard, and Fuse Series bugs.

• New features:
  • Start PreForm Server from PreForm: Choose File > Start PreForm Server to run the PreForm Local API inside PreForm, on a port you choose, without installing PreForm Server separately. The sidebar shows when the server is running. To start it every time PreForm opens, turn on auto-start and set the port it uses in Preferences > General. 
  • Form Studio 1: PreForm supports the new Form Studio 1 printer. Select it in Job Setup to prepare, slice, and send jobs. 
  • Order printed parts: Users in the United States now have a direct integration with Form Now to get instant quotes and order parts.
  • Dental presets for denture bases and denture teeth: Two new presets in the Dental Workspace to set up common denture jobs in one click. The Denture Bases preset orients the intaglio surface at 55° above the build platform to print accurately.
• Improvements:
  • Smoother, numbered holes: Drilled holes have many more edges around their rim, so they come out round instead of faceted. New holes after the first are numbered (Hole, Hole 2, Hole 3, ...) in the model edit tree.
  • More responsive graphics in large scenes: Each model now keeps a chain of progressively simpler versions, and PreForm picks the right level for each model on every frame while you move the camera. Changing the Dynamic Detail Level in Preferences > Graphics takes effect immediately, and editing the scene no longer triggers a rebuild.
• Print settings:
  • Form Studio 1: Added support for the following materials
    • Alpha Grey Resin V1 at 100 microns and 50 microns
    • Alpha Clear Resin V1 at 100 microns and 50 microns
    • Alpha Black Resin V1 at 100 microns and 50 microns
    • Alpha White Resin V1 at 100 microns
    • Alpha Fast Resin V1 at 250 microns and 150 microns
    • Alpha Model Resin V1 at 50 microns and 30 microns
    • Tough 1500 Resin V2 at 100 microns
    • Flexible 80A Resin V2 at 100 microns
  • Nylon 11 Pro Powder V1: Added support for Nylon 11 Pro Powder Fuse 1+ 30W printers at 110 microns
  • Renamed the Nylon 12 Powder V1 110 micron print setting on Fuse X1 with Beta tag while final validation is completed.
  • Added a new Production Optimized print setting (V2.0) for Denture Base Resin V2 at 100 microns on Form 4B printers, for all shades, with improvements to z-compensation. The Denture Bases preset in the Dental Workspace uses it. 
  • Updated the Default print setting for Clear Resin V5 at 25 microns on Form 4L generation printers from V1.0 to V1.1 to improve surface quality.
• Included firmware updates:
  • Form Cure V2 and Form Cure L V2: Updated firmware for Form Cure V2 (1.4.0) and Form Cure L V2 (1.3.0).
    • These updates add 2 post-cure profiles (Default and Full Cure) for the new Alpha resins (Alpha Black, Alpha Clear, Alpha Fast, Alpha Grey, Alpha Model, and Alpha White).
    • Form Cure L V2 also now runs the Tough 2000 Resin V2 Low Warp profile at 40 °C instead of room temperature, matching Form Cure V2.
• Bug fixes:
  • Realistic View highlights: In Realistic View, models outside the build volume are tinted red again, and the measure tool shows its endpoint pins.
  • Slice slider after duplicating a build: The slice slider position is now kept per build, so it behaves consistently after you duplicate a build and switch between builds.
  • Preferences cut off on macOS: The Preferences dialog scrolls again on macOS, so options at the bottom can be reached.
  • Missing tooltips in Dashboard: Tooltips show in Dashboard again.
  • Add to running job failed on Fuse: Fixed jobs added with Add to running job on Fuse 1 and Fuse 1+ 30W printers sometimes failing to start with a PRECOAT error.

PreForm Insider 3.64.0 build 983 — September 30, 2026

This Insider build adds absolute model orientation, improved build naming, and new project-specific hotkeys.

• New features:
  • Orient with absolute angles: The X, Y, and Z boxes in the Orient tool read the selection's actual orientation relative to how the model was imported instead of resetting to zero after each nudge. The value you type is applied as an absolute angle rather than a delta. 
  • Builds are named after the project by default: A build with no set name shows the project name, or "Name 1", "Name 2", … when a project holds several. The number comes from the build's current position and is never saved, so deleting or inserting a build renumbers the rest. Because the project name follows the .form file name, renaming the file renames its print jobs. This replaces the old part name heuristic.
  • Project-specific hotkeys: A new set of multi-build specific keyboard shortcuts scoped to the project you are working within. 
• Improvements:
  • Redesigned model-edit tree UI: The CAD-like feature tree has a more visually understandable re-orderable timeline, and models carrying edits line up with the rest of the model list again.
  • Placing holes and labels takes one click instead of two: After placing a hole, the first click used to only deselect it and a second click was needed to place the next one. The first click now places the next hole, with a live preview as you move the cursor. The same behavior applies to labeling as well.
  • Edge Offset Distance for Supports V2: Use this setting to offset support touchpoints away from the edges of a model (0–1.5 mm).
  • Pack, Layout, and Orient flyouts restyled, with components reordered.
  • Switching build volumes is no longer slow in large scenes. 
• Bug fixes:
  • The slice cap no longer fills the whole layer while you are drilling holes or placing labels.

PreForm Insider 3.64.0 build 963 — September 23, 2026

This Insider build adds reorderable model edits, support import on model import, and portable support-settings copy/paste; speeds up crowded scenes and heavy support generation; restores SolidWorks 2026 CAD import; and fixes a batch of support-generation, slicing, and model-list bugs.

• New features:
  • Dynamic detail level: Set graphics levels in the Preferences menu to increase render speed by reducing the maximum count of rendered triangles when moving the camera. 
  • Reorder model edits: Drag the rows in a model's edit tree to reorder its labels, drilled holes, hollows and textures.
  • Portable support settings copy and paste: Copying support settings from the flyout or a model captures them as public-field overrides in a standalone support profile, so they can be pasted onto a model using a different material and still apply. Pasting into a text editor gives you a readable export of the copied settings.
• Improvements:
  • Keep supports when importing models: When you import models and PreForm finds supports it cannot apply as-is, a new dialog lets you choose between a) importing the touchpoints and regenerating support structure from them, or b) discarding the supports. 
  • Sharper shading on engraved detail: Ambient occlusion no longer bleeds out of shallow recesses onto the surrounding surface, so engraved text reads as a dark cavity on a light face instead of a dark halo.
  • Cleaner undo history: Selecting models, selecting touchpoints in the manual support tool, and switching build volumes are no longer recorded on the undo stack, so Undo steps back through actual edits rather than through every click. Selecting touchpoints also no longer marks a manual support session as edited.
  • No confirmation prompt when deleting a build: Deleting a build no longer shows a confirmation dialog, as project-level Undo now covers it.
  • Polished Import/Add/Open dialog: The import, add, and open dialogs show the file name in color so the file you are acting on is easier to pick out.
• Bug fixes:
  • Mesh repair stuck at 0%: Fixed repair of sub-millimeter models stalling at 0% for minutes and unable to cancel, then returning a model missing much of its geometry.
  • Crash or missing geometry when slicing a reopened project: Fixed a crash (and, in other cases, silently missing slice geometry) when slicing a model with labels, vent holes, hollowing or texturing that was saved as a FORM file.
  • Ghost renames when moving models between builds: Fixed a model briefly showing another model's name in the project tree after being moved to a different build, until you switched builds and back.
  • Duplicate group names: Fixed new groups reusing the name of a hidden group. Group numbering considers every group in the scene, which also avoids duplicate names after a group is deleted or ungrouped.
  • Model count included hidden models: The count at the top of the model list counts visible models only.

PreForm Insider 3.64.0 build 918 — September 11, 2026

This Insider Program update adds a heads-up display to show relevant keyboard shortcuts during manual support editing, a redesigned .form import modal, project-wide undo/redo, and a number of bug fixes and performance improvements.

• New features:
  • Redesigned .form import modal: Opening a .form file now shows three explicit options: Import Models From File (adds the file's models into your current build), Add Build(s), and Open Project. This way, users can repeatedly import several .form files as models into one build, by dragging and dropping or using the Open dialog, similar to how it was before the 3.62 release.
  • Contextual heads-up display: During manual support editing, relevant keyboard shortcuts are displayed on the bottom of the 3D viewport.
• Improvements:
  • Undo/redo now spans the whole project: Undo and redo now operate across all builds in a project instead of being scoped to a single build.
  • Printability warnings no longer recalculate on every build switch: Switching between build volumes in a multi-build project no longer re-triggers a full printability check each time.
• Bug fixes:
  • Fixed issue where clicking the Home button did nothing on Windows.
  • Fixed issue where Scan-to-Model output for dental cases could not be labeled or have holes drilled.
  • Fixed issue where importing a CAD file with fine features could cause PreForm's default tessellation tolerance to skip a face entirely, producing a non-manifold, unprintable part with no warning shown. PreForm now shows an error when a face might be dropped.
  • Fixed issue where changing and applying settings in the Dental workspace did nothing.
  • Fixed a performance regression where duplicating, importing, moving models between builds caused performance issues on large projects.
  • Fixed performance issues that happen when switching between builds while the print validations are enabled.

PreForm Insider 3.63.0 build 887 — September 2, 2026

• New features:
  • Editable CAD-like model modifications: Model edits such as labels and drilled holes now appear as individual, named entries in the model list, so you can select, adjust, or delete each edit directly rather than having it baked permanently into the mesh.
  • Redesigned manual support tools: The Create/Select toggle in the manual supports tool has been replaced by a single brush. Click to add, and clicking a part no longer unexpectedly deletes support points. A new on-screen shortcut/hint overlay shows the available controls.
  • Copy and paste support settings: Copy the support settings from one model and paste them onto others via the Supports Flyout, instead of re-entering them by hand. 
  • Search across models and builds: A new search/filter lets you quickly find a model or build by name across the whole project. Rolling out to the Insider Program first.
• Improvements:
  • Load support settings from a model on selection: When the Supports tool is open, selecting a previously-supported model will repopulate the flyout with the values used to generate the supports on that model.
  • Reset and track changed support settings: The Supports tool now has a Reset All button to revert every non-default setting at once. It also includes indicators showing which tabs you have modified.
  • Faster SLA auto-layout on full build platforms: Laying out a fully-packed build platform is faster.
  • Faster mesh operations: Boolean and topology-cleanup mesh operations run multi-threaded, speeding up hollowing, repair, and similar edits.
  • Move distance readout and snapping: Dragging a model with the move manipulators shows the travel distance with units. Holding Shift snaps movement to fixed increments (5 mm / 0.25 in), matching how rotation already worked.
  • Per-build-volume view state: The support visibility toggle and the 3D camera position are remembered per build volume, so switching between printers restores each one's view as you left it.
  • Drag files onto new build: You can drop files directly onto the New Build button to start a new build. The button has also moved to the bottom of the side panel.
  • Print-setting edit shortcuts: Added Cmd/Ctrl+K to edit the current print setting and Cmd/Ctrl+Shift+K to copy and edit it. Both options are now available in the Edit menu.
  • Cages and frames visible in realistic rendering: SLS cages and part frames now draw and cast shadows in realistic mode; unselected cages render semi-transparent.
  • Lighter-weight support geometry: supports adaptively simplify their mesh and merge touch tips, so heavily supported scenes upload/check/render faster.
• Print settings updates:
  • Renamed the 50 micron Form 4 Black Resin V5, 50 microns setting V1.2 from from Default to Supports V1.
  • Updated the Supports V2 (V2.1) print settings for Black Resin V5 at 50 microns on Form 4 generation printers to offset auto-placed touchpoints from edges and reduce sanding time on parts.  
  • Updated Nylon 12 Powder Balanced V6.0 setting to Balanced V6.1 for Fuse 1+ 30W printers to mitigate the underdosing issues observed when using Balanced V6.0.
• Bug fixes:
  • Mirroring a grouped part wiped the scene: Fixed a serious bug where mirroring a grouped part could corrupt or erase the scene into an unrecoverable state.
  • Crash moving a model outside the build volume (Form 3/3L): Fixed a crash when dragging a model outside the build area on Form 3/3L printers.
  • Crash calculating material cost: Fixed a crash that could occur while PreForm estimated the material cost of a print.
  • Crash generating support rafts: Fixed a crash during support raft generation that made supports fail on affected models.
  • Crash during labeling: Fixed a rare crash when applying a label to certain models.
  • Startup crash on Windows: Fixed a startup crash from the updated embedded browser engine when PreForm was launched from certain Windows system locations.
  • Silent save and upload failures: Fixed cases where a failed .form save wrongly reported success and where a stalled print-job upload could hang indefinitely.
  • 3D view stutter with the printability overlay: Fixed a severe framerate drop when the printability (minima) overlay was shown on models with large unsupported regions; the view stays smooth with the overlay on.
  • Slow switching between builds: Switching between build volumes is now much faster when a build holds many (500+) models.
  • 3MF import lost the layout: Fixed 3MF import so "separate and preserve layout" keeps parts in their original positions instead of collapsing them into one corner.
  • Dental presets from Job Setup did nothing: Selecting an existing dental preset from Job Setup applies it and sets up your models instead of doing nothing.
  • Labeling failed on Dental Scan-to-Model meshes: Fixed a regression where labeling a mesh cut with Dental Scan-to-Model failed with a "mesh is broken" error.
  • More honest repair-on-import prompt: The "your model needs repair" prompt now matches what the Label and Hole tools require, and tells you honestly when a repair did not fully fix the mesh instead of reporting success.
  • Manual support editing bugfixes:
    • Fixed the manual support touchpoint preview being hidden behind semi-transparent support structures.
    • Fixed the brush ring flickering, disappearing, or jumping back to its start after finishing a stroke.
    • Fixed manual support placement so you can place points on downward-facing surfaces regardless of the cross-section slider's direction.
    • The measure tool is disabled in manual support mode, so clicks no longer place both support points and measure pins.
  • Greyed-out Update Cage button: Fixed the Update Cage button so changing cage parameters updates the cage in place instead of forcing a delete and regenerate.
  • Outside-build setting applied immediately: When "allow models outside the build volume" is enabled remotely, it now takes effect right away instead of requiring you to toggle the setting off and on.
  • Embedded Dashboard interactions: Fixed unreliable behavior in the embedded Dashboard panel, such as unresponsive login fields, a search box that closed too early, and a non-working cartridge deletion button.
  • Upload failed with long build names: Fixed print uploads failing when an auto-generated build name grew too long from a long model filename; the name is now properly clamped.
  • SLS cages flagged as out of bounds: Fixed Minimize Height SLS cages being wrongly flagged as outside the build volume when they actually fit.
  • Poor supports on parts outside the build: Supports V2 now generates the same quality inside or outside the build volume.

PreForm Insider 3.63.0 build 797 — August 5, 2026

• Announcements:
  • Native Apple Silicon builds: Native arm64 (Apple Silicon) macOS builds are available for the Insider Program, giving Mac users faster, fully native performance.
• New features:
  • Auto-arrange on import (SLA): Imported SLA parts are automatically arranged in the 3D scene as they come in, with a progress bar, so you start from a laid-out build platform instead of a pile at the origin. On by default in Insider builds; toggle it under layout preferences.
  • Rapid layout packer (SLA): A new fast planar packer lays out and re-packs plates in a fraction of the time of the previous algorithm, trading a small amount of packing density for a large speed gain. This is especially noticeable in dense dental scenes. When too many parts are added, the best-effort layout pushes the overflow outside the build rather than leaving an unprintable arrangement.
  • Layout Selected (SLA): Lay out only the parts you have selected and pack them into the free space around the parts you have already placed, which stay put. 
• Improvements:
  • Lighter support meshes: Support structure meshes are now generated in a lighter-weight form, reducing memory use and speeding up rendering and print upload on heavily-supported scenes. Enabled by default for Insider builds.
  • Per-build-volume view state: The slicer slider position, the measurement tool, and which flyouts are open are remembered for each build, so switching between build restores each one exactly as you left it.
  • Label and Hole flyouts no longer freezes the UI: Opening the labeling or hole flyout no longer greys out and locks the rest of the interface, so you can keep working while it is open.
  • Delete All custom print settings: Delete All button (with confirmation) clears your entire custom print settings list at once, instead of removing entries one at a time.
  • Smarter Print Settings Editor filtering: The Print Settings Editor now opens filtered to your current printer type and remembers your last-used filter for the session, instead of defaulting to showing all printer types.
  • Consistent flyout buttons: Primary action buttons are consistently placed on the far right across flyouts (starting with Hollow, Texture, and Label) for a more predictable layout.
• Print settings updates:
  • New Supports V2 print setting for True Cast Resin at 50 microns on Form 4 generation printers, giving an updated support option for that material.
  • Removed the New badge from the Nylon 12 Powder speed-optimized setting now that it has been available for six months.
• Bug fixes:
  • Crash on exit: Fixed several crashes when quitting PreForm (including QML window and menu-bar teardown on macOS), so closing the app is now clean.
  • Startup crash with an unknown printer: Fixed a crash on startup when the last-selected printer in the registry was one this version does not recognize.
  • Blank default name in Save dialog: Fixed a missing import that left the Save dialog with a blank default file name and folder; it now defaults correctly.
  • Save As kept the old file name: Fixed Save As silently keeping the original file name instead of saving under the new name you chose (which risked overwriting the original).
  • What's New kept reappearing on Mac: Fixed the What's New popup reappearing on every launch on macOS after you had already dismissed it.
  • Upload to Queue missing for primed SLS printers: Restored the Upload to Queue button when a primed Fuse SLS printer is selected, so you can queue additional jobs.
  • Supports dropped when changing layer thickness: Fixed supports being discarded when switching a model between layer thicknesses on the same material; your support work now survives the change.
  • Dropping a model onto a group: Fixed drag-and-drop so dropping a model onto a group's list correctly adds it to the build.
  • Show / Hide not always working: Fixed the show/hide eye icon so it reliably toggles model visibility, including on double-click.
  • Scaling moved parts around the build platform: Fixed certain models jumping around the build platform when scaled; scale and mirror now operate about the model's bounding-box center.
  • Support pillars piercing the model: Fixed support pillars that started below and grew up through the part when the raft type was set to None.
  • Trussing stopped short of the model: Fixed trussed supports ending too early at the top or starting too high at the bottom, which could cause instability; trusses now connect reliably for sturdier supports.
  • Floating pillars converted to internal pillars: Fixed lattice supports that sometimes generated internal pillars instead of the intended truss-supported floating pillars.
  • Dashboard blank on Apple Silicon Macs: Fixed the Dashboard tab staying blank after login on signed/notarized Apple Silicon macOS builds.
  • Apply button in the label flyout: Fixed the Apply button not enabling until you clicked outside the flyout; it now enables immediately as you edit a label.

PreForm Insider 3.62.0 build 718 — July 16, 2026

• New features:
  • Denture Base Resin V2: Produce durable, natural-looking dentures that exceed ISO standards with ease using Formlabs' new high-impact, Class II biocompatible denture base material. Select it from the material menu in the dental workflow. Learn more.
• Print settings updates:
  • New Default (V1.0) print settings for Denture Base Resin V2 at 100 microns on Form 4B and Form 4BL printers.
• Bug fixes:
  • Various small bug fixes

PreForm Insider 3.61.0 build 697 — July 8, 2026

• New features:
  • Send to build: Right-click a selection of parts and choose Send to build to move them to another build, or to a brand-new one. Each part keeps its position relative to the build edge, so parts outside the build stay outside at the same offset.
  • Resizable project panel: click and drag from the edge of the project panel to change its size.
  • “Add Models” from .FORM file: Add models from a local .FORM file to a build using the Add Models button, found on hover over a build title.
  • Forceful drag out of build: models can now be dragged outside the build area. Models will snap to the edge of the build and resist being removed unless dragged forcefully to avoid small overhangs.
• Improvements:
  • “Build Volume” is now “Build”: Renamed “Build Volume” to “Build” throughout the interface, and “Job setup” to “Build setup,” for clearer, more consistent terminology.
  • Projects panel polish: Reduced the passive coloring of parts in the active build for a cleaner panel; updated the machine type label to more visible text.
  • Better drag-and-drop: The target build is now highlighted while you drag parts into it, and the sidebar auto-scrolls when you drag near its top or bottom edge.
  • Faster selection on large models: Split-eligibility is now cached, so re-selecting large models no longer freezes the UI for several seconds while the Split option is evaluated.
  • Tools remember settings during a session: The Label, Hole, Hollow, and Texture tools now keep your last-used settings when reopened within the same PreForm session.
  • Version-first dental material selection: In dental workspaces you can now choose the material version first and have it filter the available shades (rather than the reverse)
• Print settings updates:
  • Form 4 Black Resin V5, 50 µm — Supports V2: New 50-micron Supports V2 print settings for Form 4 Black Resin V5 available in Job Setup.
• Bug fixes:
  • Crash fixes: Fixed multiple issues which caused crashes on PreForm exit, build switching, raft generation, and support generation with lattices.
  • Pasted supported parts floated in SLA: Parts with supports or a cage pasted into an incompatible build now drop to the platform in SLA instead of floating in mid-air.
  • Realistic view touch tips: Fixed stray protruding cones when rendering support touch tips in realistic view.
  • Models floated with Z-compression correction: Fixed models printed directly on the platform with z-compression correction above ~0.2 mm being flagged entirely as minima and floating, because the raft base layer wasn’t built.
  • Windows: .form files locked by Explorer: Fixed a file-handle leak in the thumbnail provider that left .form files locked (couldn’t rename, move, or delete) after Explorer generated their thumbnails.
  • Better build deletion: Fixed build deletion leaving job setup in an inconsistent state and issues with deleting the sole build.
  • Unsaved marker on empty build: Fixed the unsaved-changes marker appearing — with no way to save — after renaming the job title on an empty build.
  • “Untitled Project” save name: Fixed Save As defaulting to the active build’s name instead of the project name for untitled projects.
  • Imported .form build naming: Builds imported from older .form files are now named after the .form file rather than their parts.
  • Print-settings change deselected the printer: Fixed the selected printer being cleared when saving or applying print settings, unless the material actually changes as a result.
  • Form 4B misidentified after restart: Fixed Form 4B printers being treated as Form 4 in the dental workspace after restarting PreForm.
  • Raft label not updated on rename: Fixed the raft label not updating when a model is renamed in the model list.

PreForm Insider 3.61.0 build 586 — June 10, 2026

• New features:
  • Fuse X1 support: PreForm now supports the Fuse X1 SLS printer.
  • Flexible 80A Resin V2: The new Flexible 80A Resin V2 is now available in PreForm for Form 4 and Form 4L generation printers.
• Improvements:
  • Elastic 50A is now Flexible 50A: Elastic 50A Resin V2 has been renamed to Flexible 50A Resin. The formulation is unchanged—only the name is new. PreForm shows a one-time notification explaining the change.
• Print settings updates:
  • New Default V1.0 print settings for Flexible 80A Resin V2 at 100 microns on Form 4 and Form 4L generation printers.

PreForm Insider 3.61.0 build 551 — June 2, 2026

• Improvements:
  • Realistic View: Added support for the following resins:
    • Precision Model Resin V1
    • Tough 1000 Resin V1
    • Nylon 11 Powder V1
    • Nylon 12 Tough Powder V1
    • Nylon 12 GF Powder V1
  • Separate Bodies refinement: The Separate Bodies context menu option (formerly "Split Bodies", introduced in 3.59.0) is now disabled when right-clicking a single-body model, making it clear that the feature only applies to multi-body parts.
  • Z-Bleed Compensation control in Print Settings Editor: The Z-Bleed Compensation parameter in the Print Settings Editor has been redesigned for clarity. Instead of entering an offset in layer counts, you now enter the maximum compensation amount directly in millimeters, and can adjust it in increments matching the layer height.
• Print settings updates:
  • Support presets removed: The support presets dropdown has been removed from the support flyout for Form 4 and Form 4L generation printers. Users who relied on a specific preset can download them at this page.

PreForm Insider 3.60.0 build 510 — May 22, 2026

• New features:
  • Auto-recovery: Following an unexpected shutdown, you have the option to recover lost progress from automatically-saved local backups.
  • Realistic View: The view toggle in the top-right of the 3D scene switches between the standard view and a realistic view where parts are shown as they will actually be printed. See material color, touchpoints, layer lines, and textures with true-to-life accuracy. Currently supported materials:

• Improvements:
• Save full projects: Projects with multiple builds can now be saved as a single .form file. Use the File menu or keyboard shortcuts to save and load .form files normally without needing to save each build separately.
• Note: New .form files will not be backward compatible to previous versions of PreForm.
• Early Layer Merge parameter added to Print Settings Editor (SLA): Scene-wide early layer merge can be adjusted in the Print Settings Editor, providing control over build plate adhesion.
• Separate Bodies (renamed from "Part Splitting"): The multi-body splitting feature shipped in 3.59.0 has been renamed throughout the UI from "Part Splitting" / "Split Bodies" to Separate Bodies for consistency. Behavior is unchanged: right-click a multi-body model and select Separate Bodies to break it into individual models grouped in the model list.
• Confirmation before deleting a build volume: Deleting a build volume now prompts for confirmation before deletion. This prevents accidental loss of work, as the undo/redo stack is currently per-build, not cross-build.
• Bug fixes:
• Fixed issue where turning on variable Z-scaling disabled XY correction factors.
• Fixed issue where some hotkeys were disabled on Windows machines.
• Fixed issue where imported 3MF files had incorrect positions.
• Fixed issue where selecting a model triggered printability and print time recalculations. Selecting a model without modifying it no longer initiates printability checks or print time estimations. Selection is now faster on large scenes.

PreForm Insider 3.59.0 build 446 — May 6, 2026

• Improvements:
• Multi-printer capability across multiple build volumes

PreForm Insider 3.58.0 build 405 — April 28, 2026

• New features:
• Part Splitting
• SLS variable Z-scaling
• Improvements:
• Multi-material capability across multiple build volumes

PreForm Insider 3.58.0 build 326 — April 1, 2026

• New features:
• Multiple build volumes in one window in PreForm
• Optionally move parts outside of the build volume