This is a print I found on Thingiverse. My enclosure will have two Sunlu boxes sitting on top, so downward facing guides with PTFE tubes to feed into the box is perfect. The PTFE will protect the filament from any rubbing against the slot in the enclosure lid.
Sunlu Dryer Box filament guide by DiJo - Thingiverse
Prints and fits perfectly, and I prefer this bolted-on version to the one attached with double-sided tape. Revisions to the box required are the two screw holes and elongating the filament slot for the PTFE tube on an angle. Third piece provided is a drill template that also provides how much you need to dremel out the box for the PTFE tube.
The author remixed this model.