2-Spool holder (MK3S+ style) for 2040 profile

3D printable clip-on unofficial official Prusa spool holder for 2040 profiles.
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updated May 13, 2023

Description

PDF

A remix of the unofficial official Prusa i3 MK3S+ spool holder that is 3D printable and can be clipped on 2040 aluminum profiles.

All original design credits for this part go to Prusa Research and to codysechelski for sharing the reverse engineered source CAD.

Parts

  • The spool-holder-base is based on the source design and is split into two parts and modified for printing.
  • The spool-holder-handles are redesigned from scratch and simplified for easier printing.
    • One can design a more 3D printing friendly locking mechanism. I chose to keep the same as to provide compatibility of the 3D printed spool-holder-base with the original injection molded handles (tested).
  • (optional) The shown filament-guide is as released by Prusa Research (visit here for STL) 
  • (optional) 4mm PTFE adapter. 
    • You may use the filament guide with the PTFE that Prusa uses, if you source them, with the adapter, or without anything (not recommended). 
    • My testing shows that with the adapter, filament feeding is much smoother.

Hardware

  • Spool holder: 5x M3x6 & 5x M3 nuts.
  • (optional) Filament-guide: 1x M3x20, 2x M3x10 & 3x M3 nut.
  • (optional) Some grease lubricant for the handle insertion to be put both in the cylinder as well as in the internal end-stop. 
    • With that said, there is a generous amount of tolerance that I suspect will be OK for most printers. 

Print settings

I printed the final in PETG, but also tested ABS and it works fine as well. The following are done within PrusaSlicer but similar results can be obtained from other slicers.

All parts:

  • Top layers: 6
  • Bottom layers: 4
  • Perimeters: 3
  • Infill: 30% rectilinear 
  • No slicer supports required.

spool-holder-handle:

  • The handle has build-in supports for the top lock features (see green blocks in CAD pictures), remember to remove them.
  • Height range modifier: start=105.2, end=113.
    • Infill: 100%
  • At height=105.6mm:
    • Add custom g-code→M104 S255

Explanation: The additional gcode modifications for the spool-holder-handle are to help increase the layer bonding of the small lock features.

Post-processing

Just make sure there is no excess plastic on the surfaces of the interfacing features.

 

Last remark: 

  • I tested the clip-on with my 2040 T-profiles, but V-slot (as in CAD pictures) should also work fine. If you try, let me know if tighter tolerances are needed.

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Change log:

[18-04-2023] First upload.

[19-04-2023] Edit - spool-holder-handle: Added missing contact interface tolerance between handle and base. The tolerance at the other end of the contact (locking mechanism) should already be enough. But this will make insertion even easier.

[19-04-2023] Compatibility: Tested the spool-holder-base with the original injection molded handles and they can work well,  in case anyone is interested. They do not lock as in the original base (they can rotate if enough torque is applied), but no spool will do that alone. Therefore, they can be considered compatible.

[20-04-2023] Edit - filament-guide-adapter: Noticed a pull difficulty when using full 1kg spools. Updated such that the PTFE tube extends to the end of the adapter. It is short of a push-fit so it requires a bit force to push the PTFE all the way into the adapter. That seems to ease the filament feeding.

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Tags



Model origin

The author remixed this model.

License