The Form Wash L requires regular maintenance and care. The standard maintenance cycle for cleaning the machine is every three months of use, or as indicated on the touchscreen. Some resins are abrasive and may require you to replace the wash bucket after extended use.

Follow the cleaning schedule to inspect, clean, and maintain your Form Wash L on a regular basis.

As more parts are cleaned, the solvent gradually becomes more concentrated with liquid resin and reduces the effectiveness of the Form Wash L. Replace solvent when indicated on the touchscreen or when the wash is no longer effective and when parts have tacky surfaces after washing.

• For isopropyl alcohol (IPA), replace the used solvent when the resin concentration reaches 10%.
• For tripropylene glycol monomethyl ether (TPM), replace the used solvent when the resin concentration reaches 30–32% or when the specific gravity is above 1.0.
• For Formlabs Resin Washing Solution, replace the used solvent when the specific gravity is above 0.975. The hydrometer packaged with the Form Wash does not measure the correct range of specific gravity for use with Formlabs Resin Washing Solution. A hydrometer that can measure a specific gravity of 0.900–1.000 should be used instead.

To measure the resin concentration of solvent with the solvent monitor:

1. If you are currently viewing a submenu on the touchscreen, tap the < arrow until you return to the home screen. The home screen lists the current wash settings and the status of the Form Wash L.
2. The current solvent type and resin concentration are listed under Solvent.

The level of resin concentration in the solvent in the Form Wash L increases gradually as more parts are cleaned, reducing the effectiveness of the wash. Replace the solvent when indicated on the touchscreen. Transfer solvent from the Form Wash L into a chemical resistant container that is safely designated for highly-resin-concentrated solvent and to refill the wash bucket with fresh solvent.

To replace solvent:

1. Put on a clean pair of nitrile gloves.
2. On the touchscreen, tap Solvent. The Solvent screen appears.
3. Tap Replace Solvent. Follow the on-screen instructions to empty and refill the wash bucket.
4. Using the electric siphon pump, pump the solvent out of the wash bucket into an appropriate container:
   1. Place the pump intake into the wash bucket.
   2. Securely place the flexible pump hose into the solvent container.
   3. Press and hold the pump switch to pump solvent into the solvent container.
5. If necessary, clean the wash bucket.
6. On the touchscreen, select the solvent type.
7. Using the electric siphon pump, fill the wash bucket with fresh solvent to the indicated fill line:
   1. Place the pump intake into the solvent container.
   2. Securely place the flexible pump hose into the wash bucket.
   3. Press and hold the pump switch to pump solvent into the wash bucket.
8. Dispose of used solvent according to local regulations:
   1. Isopropyl alcohol (IPA)
   2. Tripropylene glycol monomethyl ether (TPM)

Over time, dissolved resin accumulates on the walls of the wash bucket. Periodically, clean out the wash bucket to remove these resin deposits. Rinse the wash bucket with fresh solvent and wipe with a paper towel.

To clean the wash bucket:

1. Using the electric siphon pump, pump all solvent out of the wash bucket and into a container appropriate for your solvent of choice.
   1. Place the pump intake into the wash bucket.
   2. Securely place the flexible pump hose into the solvent container.
   3. Press and hold the pump switch to pump solvent into the solvent container.

3. There are two circular impellers located at the bottom of the wash bucket. Using a 2.5 mm hex driver, loosen and remove the screw holding each impeller in place. Set the screws and impellers aside.