"Ice Fishing" MK4 Filament Guide for Prusa Enclosure

For printing TPU on the MK4 I wanted the filament path to be as smooth and straight as possible. I use a roller bearing spool holder on top of my Prusa Enclosure and skip the bowden tube. The resulting parts are fantastic!

This model accepts the filament guide PTFE tube from the MK4 and secures it using an M3 screw and nut, same as the original.

The vertical filament line held taught as it descends a frosty opening reminds me of ice fishing.

Parts and Assembly

This print uses the following parts from one side of the filament guide (leaving the other side intact for continued use with the lid open, or on another printer):

- Filament guide PTFE tube (1x) - M3n nut (1x) - M3x10 screw (1x) - Nylon rivet (2x) Assembly instructions match those of the filament guide .

The enclosure-top-filament-guide.stl version prints as-is, but does not plug the top center hole, only covers it.

The enclosure-top-filament-guide-needs-supports.stl retains most of the plug but must be printed with supports.

The guide/cover is held in place by nylon rivets, as shown in the enclosure assembly guide .

Printing

enclosure-top-filament-guide.stl is an easy print. default settings are fine.

Print enclosure-top-filament-guide-needs-supports.stl at a .20 mm layer height or less, otherwise the lip on the bottom that retains the PTFE tube might delaminate. I used .15 mm and removing the organic supports took a bit of patience but eventually they came off as a single sheet and I quite like the result. PLA Galaxy Black matches the enclosure finish nicely.

Source

The OpenSCAD file for these models requires the source files Top-plug-center.stl and filament-guide-R1.3mf from the remixed projects. I've also created a github project with all the necessary pieces if you wish to edit the models further.