I’m running a 3L and using Tough 2000. Every now and then the mixer arm gets disconnected from the magnets during the setup before a print. According to Formlabs FAQ, this happens because of previously failed prints and residual cured resin in the tank that gets stuck between the mixer arm and the magnets. Every time this has happened to me I take out the tank and check for cured resin but I’ve never found any. Has anyone else had this problem and does anyone know if there is a fix? It’s very annoying because you can start the printer and go home, you need to baby sit the printer during the entire setup, which takes a long time with the 3L.