Yet Another Filament Guide
thingiverse
Attached securely to a 4020 V-Slot extrusion is made easy. The hole provided accommodates a 4mm PTFE tube with precision. Load the filament, unscrew the cap and insert some cotton wool inside to give your filament a thorough wipe as it emerges. Optionally, you can add a little lubricant for an extra layer of smoothness.
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