my Up box plus has just developed a strange fault after 2 years fault, filament extrudes ok and extracts ok when loading a new roll of filament, but after doing a manual level test to make sure all is ok, once the print starts the drive gear is just clicks like there is a jam and no filament is drawn in, i stop the print immediately and extrude some filament manually it comes out fine, so no blockage. i have changed the head with a new one today ( New ABS variant ) set it up and the same thing happens, extrudes manually but not during a print! ive had no issues with this printer up to now, all i can think it is is something wrong with the latest software update?
HELP!
