Support pin for filament spool holder with guide bushing
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A support pin that makes use of the guide bushing that comes with Prusa MK4s printers to guide filament off the spool.
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- Creative Commons — Attribution — Noncommercial
This support pin makes use of the guide bushing, screw, and nut from the filament holder that comes with Prusa Mk4s printers (and perhaps earlier ones) to guide the filament coming off the spool. Depending on how it's orientated, without this the filament can slide off the side or cause the printer to think it has detected a collision when the filament hangs up. This design helps with both.
Note that there is probably a correct way to orient this, with the flange in the bushing hole towards the printer. But I have to hang the whole support ‘backwards’ because of how it works with my wire shelves, so the guide bushing could potentially get pulled out. With the screw to tighten things up, I don't think this will happen.
The pin is tight enough when printed on my printers that it stays in place. But you can optionally use a M2x8 or x12 screw into the pin ends to hold it together. I used a M2x8 screw, along with a M2 and an M4 washer to secure it.
The filament holder for the Prusa is printed in PETG, but I printed this in PLA and it worked fine. I used 2 perimeters, with 15% Gyroid infill. But I suspect that it's pretty tolerant of these settings.