Self-Aligning, Adjustable-Width Spool Holder Using 608 Bearings

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I use plastic ends for every spool I've fitted since getting my first 3D printer back in 2010. All parts are perfectly aligned for printing with the correct orientation. Printing PLA at 0.2mm layer height with 20% infill worked great for me, and a raft keeps the surface finish consistent. Tracks require only a small amount of easily removable support. The pin (x4) will have an interference fit if you print it separate and scale it up by one or two percentage points, allowing it to push into place permanently with the arms. If you don't want to scale and print four pins until they work perfectly, just print as-is and add a tiny amount of cyanoacrylate glue to the hole (at the ends of the x-arms) that the pin goes into, but not on the shaft of the pin. The nut (x4) should fit snugly if printed correctly. If it's too tight, try scaling it up in the x/y directions by one or two percentage points to get a looser fit.