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Prusa Spool Holder and Support for 1kg Spools

by bsthomps, published

Prusa Spool Holder and Support for 1kg Spools by bsthomps Feb 1, 2013

Description

Yet another spool holder for the Prusa, but this one has all the benefits/improvements I could think of.

-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

-ENJOY!

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Recent Comments

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Alright, uploaded a new stl file for ya for an 81mm spool. Enjoy!

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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Instructions

Print one of each Bent Spool Holders (Left and Right), then an inner and outer Spool Support for each spool that you have.

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Comments

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Anonymous on Feb 9, 2014 said:

I love to hear the determination from you man, but modifying stl's is pretty difficult since its not really a solid, but essentially just a million tiny planes used to approximate a surface.

Let me know exactly what changes you need and I'll throw another stl up here for ya. We're all here to help and its always great to add another great mind to the 3D printing community!

bsthomps on Feb 9, 2014 said:

Man, Thingiverse has always sucked at anything to do with messaging...

davidjh78 on Feb 9, 2014 said:

I'm just started in 3D printing, and made the bent supports as the first useful print (after a trial 20mm cube) on the Prusa Mendel i2 printer I just made. They look very nice, seem sturdy, and fit on the top bars quite snugly. I have a question on the spool holders: My 1 kg spool (from MakerGeeks) seems wider than the spool holders were designed for. It is about 81 mm wide along the axis. I'm assuming that the ends of the inner spool are intended to go all the way through the outer spool and snap out to hold the two spool holder pieces together. Is that correct? I haven't figured out how to use any existing programs to edit stl, but I think can write a "stretcher" program that filters an ascii stl file and moves all vertices past a certain cut plane in some axis. I would stretch at the solid part of the inner spool holder, before it divides into the 5 segments.

bsthomps on Feb 9, 2014 said:

I love to hear the determination from you man, but modifying stl's is pretty difficult since its not really a solid, but essentially just a million tiny planes used to approximate a surface

Let me know exactly what changes you need and I'll throw another stl up here for ya. We're all here to help and its always great to add another great mind to the 3D printing community!

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