Form 3 stuck at filling - 45 minutes now


Printed several items from a new Grey V4 tank. Have one part left that is 62ml with supports. I know the cartridge is empty but the tray is very close to full and I expected the printer would figure this out, tell me so and offer to continue with the print.

Nope - after watching the mixer just go back and forth for 45 minutes I called support. They said a bug is preventing that message from appearing so tough luck getting that last 62ml part out of the roughly 300ml of resin that is sitting in the tank.

Nice work.


Use a long stick and lift the fill float into the full position and hold it until it says filling done or similar. Hope this helps.


Reboot the printer and restart the print.


Thanks I will try that.


Is it that you don’t have another Grey cartridge on hand or you don’t anticipate using Grey anymore and want to just use it up? I think the solution winds up being the same thing xxblindxx said - fooling the printer into thinking the tank is full, but I just wonder why you wouldn’t just stick a new Grey cartridge in and keep going.


Just didn’t have another cartridge on-hand. I have resolved that and printed the part.


This is a known issue with the resin level sensor and the fixture of the problem is simple:

  1. Install the latest firmware
  2. Run Calibration of lever sensor (new firmware has this option)

I had the same issue with the resin - cartridge was empty but tank was overflowing, initially tilted the printer during the start to fool the sensor but after the latest firmware updates and calibration of the sensor everything works as expected


Level calibration is not working for me with latest firmware- its stuck on stage 4 and not performing the calibration.
have to boot the machine every time I try
are you experiencing the same issue?


Wait for about 20 mins.I have the same issue like you.It tooks longer than you thought.


If you can’t complete the calibration you may have problems with the sensor and you need to contact the FormLabs customer support