Summary I really liked the design of randyy's spool www.thingiverse.com/thing:8317. I'm sure the spool works well attached to the clip, but I didn't want to use one of those. I already had a spool holder that holds the spool via a rod, and when I tried using this spool on it, it leaned over to the side. All I did was to add a simple tube that protrudes from the central axle, this gives it the support it needs to remain upright when held by a simple rod. Instructions Print the modified hub, then you'll also want to download the original spool arms from www.thingiverse.com/thing:8317. Also, this isn't part of my derivative, but my picture also shows me using the adjustable clips from www.thingiverse.com/thing:16357 by smartroad. I do recommend these as it makes the spool much easier to use when you constantly switch filament colors like I do.