BobbyJackT

I work for a university and we have two Ultimaker 3 Extended printers, one of them is having an issue where the second filament, PVA, keeps extruding lightly when it should not be and gets all over the print and the PLA. It also sounds like it is crackling when it is extruded as well. When it does try to print PVA though, it does not adhere to the build plate like the PLA does. It also sometimes cracks and does not make it to the nozzle. Anyone know how to fix this?