M3D Spool Holder v2

I kept breaking tabs on the spool holder so I made a couple of modifications to the one 753630.

I made the hole smaller and thicker to fit and ride the spool holder better.
I added braces to the tabs to stop them from breaking off.
I made the outer ring twice as thick to make it more beefy.

I am going to make a left and right side one, because the M3D spools have a slightly bigger hole on one side.



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