There could be something wrong with your printer, like in the above linked thread where the feeder was assembled wrongly and didn't have enough grip on the filament.
But, PVA material easily absorbs moisture and then will give bad printing results.
There are 2 tests to check your filament quality:
- Take a 30cm of filament and bend the material. Material in good condition will bend, but not break. If the material snaps off relatively easily, the material has deteriorated in quality.
- While the filament is loaded, purge the material from the extruder. As the material extrudes from the nozzle, the material strand should appear flat and un-textured. If the strand appears to have texturing or visible bubbles in the purge strand or you hear a popping sound, then the material has absorbed moisture.
Here is info on drying your filament: https://support.ultimaker.com/hc/en-us/articles/360017464340-How-to-dry-Ultimaker-materials-
here we had written about it.
Yes, with 3D printing there are temperatures that should be maintained.
For FDM, >16°C/61°F is recommended.
To find causes it may help to have a new/fresh PVA roll from a 3D printing reseller.
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