PTFE tube connector for PolyDryer drybox

This connector fits into the opening of the Polymaker PolyDryer dryboxes and attaches to the smaller 4mm PTFE tubes. This is useful for boxes that are equipped with an auto-rewinder spool and ensures the tubes are not pulled inside (this is not a problem for the larger 6mm tubes).

It may also be used to increase friction (lower InnerDiameter appropriately in the f3d file parameters). This allows you to use PolyDryer dryboxes with auto-rewinders as buffers for the MMU3 (which is otherwise tricky as the spools pull the filament out of the MMU).

No supports are required. Tested with PETG, but PLA should work too (adjust tolerances in the f3d file if needed: InnerDiameter for the filament, TubeDiameter for the PTFE tube).