IKEA LACK Filament Guide, screw version PTFE compatible

UPDATE 2019/08/14: Added a shorter version for the IKEA Platsa system with 42mm plate

UPDATE: Thanks to the comment from TheRyuuProject I change the design to be parametric and uploaded a new version with 4,2mm inner diameter and 9,8 outer diameter as well as one with only 2,2mm inner diameter for direct filament feeding.

I am building the Prusa IKEA LACK enclosure. The original design with only a central filament guide limits the usable print volume of the printer, since the filament gets way too much bent when the extruder is close to the top of the enclosure and moving along the X-axis. Therefore I intend to upgrade to a slot guide in the future.

This filament guide is designed to be fixed in place without glue, allowing easy removal at a later point of time. The internal diameter of 4.2mm makes it compatible with 4mm PTFE tubes as they are used with filament dry-boxes like the SPANNERHANDS design.

The photo shows a prototype with 3mm bore and M6 thread, the final versio