PVA doesn’t extrude consistently from UMS3

[matteolopreti 0]

I’m having troubles with printing of PVA support materials with my Ultimaker S3.

I’m printing from a Core B0.4 (new), I’ve recently changed the Bowden cable, and the filament is also new.

 

When i load the material, it seems to be extruding correctly. I’ve then tried the calibration procedure, but from a certain point on, the PVA did’t extrude well any longer.

When I unloaded and loaded again the filament, it managed to extrude again. The signs on the filament made by the feeder look regular.

 

Can anyone figure out what is happening?

[Framar 38]

Make sure your spool of PVC is dry.

[Smithy 1,144]

PVA gets soft very quickly in higher humidity. So store it always in a bag or box and when you do longer prints consider to buy a DryBox or something like that.

[RudydG 62]

PVA is very sensitive, like even 24hrs exposure to humidity can give big problems.

In the early years i wasn't aware of this, and it made me having lots of troubles which i never could identify.

Since i changed my behavior with these kind of filaments, i no longer have any problems.

You can use a drybox, but, and this is my current way of working, you can also only cut the needed length of the roll PVA, and put the rest back in the original sealed bag with its dessicant.