MK3s Filament Guide - Extended - R4 part
thingiverse
I installed this extruder motor cooler (https://www.thingiverse.com/thing:2975582) and had to enlarge the opening so I wouldn't have to look behind my cooling fan to insert the filament since my printer is in a Lack enclosure. This modified part is based on the stock Prusa R4 design, with a taller wider model also available.
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