Using Castable Resin
Castable Resin is optimized for the best burnout performance, but developing a specific burnout and casting process is up to you. Below, we provide guidelines for a process that has worked well during our testing process.
Castable resin allows you to take the high resolution of the Form 1+ and capture it for investment through the mold making process. Developed specifically with burnout in mind, the resin burns out cleanly with no ash or residue, making it perfect for jewelry making, metalwork, and engineering applications.
Our Castable resin is designed to burn-out cleanly. We've tested the burn-out schedule below with great results using R&R Plasticast with BANDUST.
1. Preparing a Print for Investment Casting
Print and Finish Your Part
The casting process is a skill and an art form. For successful results, design of the piece to be cast is as important as the material it's printed with and cast into. You want to design for material flow, so when modeling, avoid sharp corners and moving from thick to thin profiles on the same piece.
Follow the normal post-print procedure:
- Allow part to fully dry after removing from the IPA bath.
- Carefully remove support material from your print.
- Gently sand away any support marks so they do not appear in your cast.
Unlike other Formlabs resins, do not finish the print with mineral oil after sanding.
- Post-cure the part in a UV chamber for at least 2 hours.
Post-curing is an essential step in preparing your part for casting. It will make the print stronger, leading to a crisp, cast piece. Skipping this step could lead to poor burnout performance.
Prep the Model for Casting
- Add wax sprues and gates to the print as you would for lost wax casting. Ideal positioning will vary with part geometry.
Instead of adding wax sprues post-print, you can build them into the part directly using your CAD design software.
- Attach the part to a rubber sprue base using softened wax. Make sure the wax is as smooth as possible.
- Attach a casting flask to the rubber sprue base.
2. Preparing the Mold
- Weigh and mix the investment according to the manufacturer's instructions.
- Degas the container with mixed investment in a vacuum chamber.
- Pour investment into casting flask.
- Degas the filled casting flask in the vacuum chamber again.
- Place filled casting flask on flat surface and allow to dry according to manufacturer's instructions.
- Remove the rubber sprue base and allow investment to dry for another 2 hours.
- Place casting flask in a furnace and heat according to the burnout schedule provided above.
Not following the burnout schedule provided may result in damaged parts.
- Remove the mold from the furnace.
- Cast as you normally would.
Casting is an involved process. For best results, work with a casting specialist.