Ultimaker S3 and Ultimaker S5 user manual 29
Grinding PVA
Incorrect material handling or storage can lead to grinding of the material. PVA should be printed and stored at a
low humidity to avoid problems while printing. We advise a humidity below 50% for storage and below 55% while
printing. It is also recommended to keep the ambient temperature below 28 °C while printing.
When PVA is ground down by the feeder, there are three main causes:
• Incorrect storage. Ensure that the PVA is stored in the recommended conditions
• Coated Bowden tube. Clean the Bowden tube and dry it very well
• Clogged print core. Clean the print core with hot and cold pulls
For more information on how to resolve grinding issues, take a look at the Ultimaker website.
Under-extrusion
In simple terms, under-extrusion is when the printer is unable to supply a sucient amount of material. Your
Ultimaker S3 / S5 is under extruding when you see missing layers, very thin layers, or layers that have random
dots and holes in them.
Under-extrusion can have several causes:
• Use of low-quality material (diameter inconsistency) or incorrect settings
• Feeder tension not correctly set
• Friction in the Bowden tube
• Small particles of material in the feeder or Bowden tube
• A partial clog in the print core
If your Ultimaker S3 / S5 is aected by under-extrusion, it is advised to take a look at the Ultimaker website for
detailed troubleshooting instructions.
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