M3d Pro side mount large spool plus guide
thingiverse
I wanted a side mount spool holder for my pro, Found this one but it was too small for my big 3rd party spools, so I modified it. https://www.thingiverse.com/thing:2432747 I created 2 sizes of shaft to accommodate 3in wide or 4in wide spools, you should be able to use the original shaft as well if those 2 are too long. I added structural support for the extra weight and extended the arms out to 5.5in
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