Over time, solvent accumulates dissolved liquid resin, which reduces its efficacy. For best surface quality, replace your wash solvent when the resin concentration is too high or when it no longer effectively cleans printed parts.

When using a Form Wash, a Form Wash L, or a Finish Kit, check the resin concentration with a hydrometer.

• For isopropyl alcohol (IPA), replace the used solvent when the resin concentration reaches 10% or when the O-ring of the hydrometer that is included with the Form Wash (after it is calibrated in fresh IPA) rises above the float's tall wings.
• For tripropylene glycol monomethyl ether (TPM), replace the used solvent when 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.

When using a Form Wash L, the included solvent monitor measures the resin concentration. The Form Wash L notifies you when the solvent needs to be replaced.

Before replacing the solvent in the Form Wash or Form Wash L, ensure the included siphon pump has been properly assembled.

Purchase the following additional supplies to replace solvent:

• Chemically resistant container designated for safe storage of unpolymerized plastic resin and IPA or TPM.
• Sufficient replacement IPA (90% or higher) or TPM.
• TPM only: A hydrometer that can measure a specific gravity of 0.962–1.000.

The Form Wash V1 and Form Wash L come with a siphon pump for moving solvent between the wash bucket and solvent containers. The Form Wash V2 does not include a siphon pump. Solvent can be poured from its container directly into the wash bucket.

A battery-powered siphon pump is also available for sale on the Formlabs Store.

Remove the wash bucket and inner lid

1. Turn the Form Wash knob to select Open on the display.
2. Push the knob to confirm. The Form Wash raises the mount and basket out of the wash bucket, and opens the inner and outer lid.
3. Lift the wash bucket forward and upward to remove it from the base.
4. Set the wash bucket on a clean, stable surface.
5. Lift the inner lid to remove it.

Transfer used solvent into an empty container

1. For optimal flow, elevate the source container—the wash bucket with used solvent—above the empty receiving container.
2. Place the rigid tube (B) in the source container and the flexible tube in the receiving container.
3. To initiate flow, squeeze the handle (A) several times, then hold.
4. Gradually release the handle when the solvent begins flowing through the flexible tube.

Clean the wash bucket (optional)

For the cleanest wash, rinse the wash bucket with IPA or water, then wipe any remaining residue with a paper towel.

Refill the wash bucket with fresh solvent

Use the siphon pump to refill the wash bucket between the minimum and maximum fill lines.

Install the inner lid

Align the front edge of the inner lid with the wash bucket's edge and lower the inner lid directly into the top of the wash bucket.

Insert the wash bucket

Insert the wash bucket into the Form Wash.

Remove the wash bucket and inner lid

1. Turn the Form Wash knob to select Raise on the display.
2. Push the knob to confirm. The Form Wash raises the elevator and basket out of the wash bucket, and opens the inner and outer lid.
3. Lift the wash bucket forward and upward to remove it from the base.
4. Set the wash bucket on a clean, stable surface.
5. Lift the inner lid to remove it.

Transfer used solvent into an empty container

1. Place the intake end of the electric siphon pump into the wash bucket.
2. Securely clip or hook the flexible pump hose onto the empty solvent container. Position the hose so that the tip will stay above the solvent until the container is almost full. The hose has a sensor that will turn off the pump when the tip is submerged.
3. Turn on the pump switch to transfer solvent from the wash bucket to the solvent container.

Clean the wash bucket (optional)

For the cleanest wash, rinse the wash bucket with IPA or water, then wipe any remaining residue with a paper towel.

Refill the wash bucket with fresh solvent

Pour solvent into the wash bucket or use the siphon pump to refill the wash bucket to your desired fill level.

Install the inner lid

Align the front edge of the inner lid with the wash bucket's edge and lower the inner lid directly into the top of the wash bucket.

Insert the wash bucket

Insert the wash bucket into the Form Wash. Ensure that the inner lid assembly sits below the tabs at the base of the outer lid. If it sits on top of these tabs, the Form Wash elevator will jam and be unable to lower properly.

Select your solvent

1. On the touchscreen, tap Solvent. The Solvent screen appears.
2. Tap Replace Solvent. Follow the on-screen instructions to empty and refill the wash bucket.

Transfer used solvent into an empty container

1. Place the intake end of the electric siphon pump into the wash bucket.
2. Securely clip or hook the flexible pump hose onto the wash bucket. Position the hose so that the tip will stay above the solvent until the wash bucket is almost full. The hose has a sensor that will turn off the pump when the tip is submerged.
3. Turn on the pump switch to transfer solvent from the wash bucket to the solvent container.

Clean the wash bucket (optional)

1. Tap Raise. The platform mount rises out of the wash bucket.
2. Open the Form Wash L door and gently pull the wash bucket towards yourself to remove it from the Form Wash L.
3. The wash bucket is still connected to the machine via the solvent monitor at this time, so place the wash bucket next to the Form Wash L.
4. Unclip the solvent monitor bracket from the front edge of the wash bucket.
5. Lift the solvent monitor bracket (with the solvent monitor attached) out of the wash bucket and set it aside on a paper towel or other absorbent surface.

6. Lift the inner lid off of the wash bucket. Set it aside.
7. Remove the impellers and inspect the area underneath the impellers for signs of wear. Visible gouges are a sign that wash bucket failure is imminent and the wash bucket must be replaced before continuing use.
8. If no damage is visible, reinstall the impellers.
9. Clean the wash bucket and reinsert it into the Form Wash L. Push the wash bucket in until it reaches the back wall of the unit.

Reinstall the wash bucket

1. Place the inner lid back onto the wash bucket.
2. Reinsert the wash bucket into the Form Wash L. Push the wash bucket in until it reaches the back wall of the unit.

Refill the wash bucket with fresh solvent

Use the siphon pump to refill the wash bucket with new solvent.

1. Place the electric siphon pump intake into the solvent container.
2. Securely place the flexible pump hose into the wash bucket.
3. Turn on the pump switch to transfer solvent from the solvent container to the wash bucket. Refill the wash bucket between the minimum and maximum fill lines.

Replace the solvent monitor

Clip the solvent monitor bracket (with the solvent monitor attached) onto the front edge of the wash bucket.

Refer to the SDS sheets and your local regulations for proper disposal methods.

IPA

Refer to the support article Isopropyl alcohol (IPA) for more information about safe disposal of used IPA.

TPM

Refer to the support article Tripropylene glycol monomethyl ether (TPM) for more information about safe disposal of used TPM.