Prusa Spool Holder and Support for 1kg Spools
by bsthomps, published
-Bent support design allows filament to line up directly above extruder and not rub on anything
-My spools were damaged in shipping and the two sides were no longer attached. This inner and outer support holds the two halves together and allows for smooth rotation on the rod
-Spiral slots so that the holder can simply be lifted on and off of the machine without needing to take apart your Prusa in any way. Extremely rigid to the frame when the spool is cantilevered on the end, but the spiral slots allow for easy removal without binding
-Only vitamin is a leftover piece of threaded rod (and a 3mm Set Screw for added security locking in the threaded rod)
-Weight/Filament savings optimized for strength
-Spool inserts pivot smoothly on threaded rod with no bearings. If you look close you can see the inner pivot is extended up into the spool supports
-Spool insert halves securely snap together. No bolt/hardware needed
-Width is only constrained by length of threaded rod so you can have 1-3 spools on here
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You guessed it right on the latter, as a friction fit. As for the STL modification, sounds like you know way more about that topic than I do. I pretty much stay in the solidworks world until STL.
I'll take a look and see how wide my spools are and lengthen it for you if needed for an 81mm spool.
Thanks for the quick response. My main question was whether the wider ends of the 5 segments of the inner spool holder were supposed to stick out past the end of the outer spool holder to hold the two ends together, or if they are supposed to friction fit insider the outside spool holder. I had been thinking the former, but have decided it must be the latter, since otherwise the protruding ends would interfere with the bracket. Please confirm or explain how they are actually supposed to fit together.
Regarding modifying STL, I understand that it's hard to do in general, but I already modified the outer spool in emacs by adding 20 to all the maximum Z coordinates (34.92499) which were the top of the inside cylinder, and it slices OK and looks OK in sketchup. I basically just stretched all the little planes that cross the cut line.And I think for the inside friction fit that will work for me. But what I really need is just something to work with an 81 mm wide spool, so if you have a better alternative or see something wrong with my change, I'm open to a different approach.
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