We started using UM PVA in the material station, was always brittle, never got a single print out of it.
Support didn't offer much help with how to confirm the material station was actually doing what it should be with the humidity control.
Found the API pages and built our own monitoring page to keep an eye on it all, the station is working but still had no luck with the PVA. Switched to BVOH soluble material and its working great.
have you been keeping the PVA either in an air tight plastic package or in the material station (MS)?
If you do "move material" (middle menu on the left, select pva towards the top right then click the vertical "..." and select "MOVE") and if you wait for it to heat and push the down arrow to extrude does it pop and hiss due to boiling water? Or just steam a little bit? (if it steams but silently it's probably okay).
While doing the move, put a kink in the extruded filament near the nozzle and see how quickly you can get that to reach the bed by pressing the down arrows quickly but not too quickly (there is a perfect medium where you get max extrusion rate). 5 seconds is fantastic. 10-20 seconds is good. 25 seconds means you probably have something wrong with your feeder, your print core, or the filament has cracked.
Also check that the front fan is working. not the side fans. Make sure it is spinning when you are doing that MOVE command. You can back up the filament with the up arrow so it stops extruding, then pop open the door and check that the fan is spinning just fine. When the fan stops spinning you end up with mysterious underextrusion issues.
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