I’m short so I mounted my Tevo Little Monster’s spool holder on the left upright. This causes some strain on the filament as it enters the extruder, particularly near the top. I made this simple remix to add a filament guide that moves the strain point above the extruder.

The hole is big enough for 2mm PTFE if one wanted to protect the filament further. That turned out to be unnecessary for me.

Made in Tinkercad: https://www.tinkercad.com/things/hQdF3C2H7v9

The print in the photo was printed with ProtoPasta Matte Fiber White PLA