[Sonic Mighty 8K] Replacing the FEP film

Replacing the FEP film or PFA (nFEP) film is an essential maintenance task for resin 3D printers. It needs to be changed if it becomes dented, deformed, or pierced, but minor scratches and smudges on the film usually don't require replacement as they don't affect print quality.

If you need to replace a new FEP film, follow these steps:

The FEP film needs to be replaced periodically. Learn more about when to replace it here

Disassembling the Resin Vat

1. Take the VAT and clean it thoroughly with the sanitizing alcohol, then use a soft paper towel to wipe it and let it dry.
2. Place the resin vat in an upside-down position and loosen the screws from the vat
3. Take the metal frame off the bottom of the resin vat with a 2mm Allen wrench
4. Set aside the resin vat
5. Flip the metal frame over and use a 2mm Allen wrench to remove all screws
6. Remove the old FEP film
7. Clean the vat and frame to remove any residual resin.

To loosen stubborn screws, apply alcohol, to the screw joints and let them sit for about 15 minutes before attempting to loosen them again. For details, please refer to How to Remove Stripped Screws

Adding New FEP Film

1. Remove the protective film on both sides before installing them onto the frame
2. Refer to the video and sandwich the new PFA film between the two metal frames.
3. Hold it in place and once the holes and everything else are properly lined up
4. Poke holes in the PFA film with a sharp-pointed item like a wrench
5. Tighten the 8 screws located at the corners, alternating between opposite corners to ensure even tension
   
6. Tighten the 6 screws located in the middle of each side, alternating between opposite screws.
   
7. Tighten the remaining screws alternatively

Reassembling the Resin Vat

1. Place the newly installed PFA flim frame back into the resin vat. The holes with the bevels should be pointed up
2. Tighten the 4 screws located at the four corners of the frame diagonally
   
3. Tighten the 6 screws located in the middle of each side diagonally
   
4. Tighten the remaining screws
   
5. Using a box cutter, trim the excess PFA film as close to the vat as possible, ensuring that nothing protrudes
6. Finished