Summary

Having assembled my LACK printer shelf (and eventually enclosure), I need to feed the filament from a drybox through the top of the shelf in a clean and tidy manner.

This thing screws together though a 12.5mm (half inch) hole drilled through the top of the shelf, and tightened with a coin in the printed slots at the flanged end of both parts.

The feedthrough accepts a 4mm ptfe tube to be inserted as a low friction guide for the filament.

Filament PETG (or PLA)
Temperature 230°/65°C
Infill 100%
Support none
Adhesion Brim 5mm

If you use Cura, set "Slicing Tolerance" to "Exclusive" for easier threading.