Prusa i3 MK Filament Guide ClipOn

The Prusa i3 kit comes without a filament guide - this is a problem when using stiffer filaments on small spools. The filament tend to unwind and get stuck when printing.

This filament guide is a two part solution, a base with a new ClipOn design to lock the guide to the Prusa frame and an interchangeable filament guide (loop).

The ClipOn Holder (base) it is securely locked to the aluminum frame, but still easy to re-position. The loop has a friction fit into the holder that closes the filament loading slot and prevents the filament from escaping the loop when printing.

Selecting models:

- Select a ClipOn Holder with or without filament store hole. - Select a Loop size and if it should have filament slot. I often forget to put the filament through the loop when loading, the solution is the guide with filament slot.

If the holder has a loose fit, scaling it to 99% of original size should give a more tight fit.

Let me know in the comments if you have ideas or changes to the design.

See also: Prusa i3 MK Filament Guide Dust Clearner for ClipOn base to use with the same holder.

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Print instructions

Print with PLA, ABS, PET-G or similar.

2 perimeters, 3 top and 2 bottom layers 30% infill.

Gcode file is for printing one holder and large loop in Devil Design PETG (MK2/S, MK2.5/S, MK3/S, MK3S+).

Post printing: The loop should fit into the base, but you may need to smooth the loop guide surface with a knife or sand paper to get an easy friction fit into the base.