Wanhao Duplicator 6 Filament Spool Holder with printed bearings (no hardware needed)

UPDATE 8/7/2017

I now consider this part to be obsolete, and am now using this:

https://www.thingiverse.com/thing:2473199

If you would prefer to print the model with the internal bearings, please use at least 40% infill on the central shaft to extend it's lifespan. Also, make certain the central shaft fits snugly, so the roller does not move away from the back of the printer and create a weak spot. Thanks!

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There are quite a few Wanhao D6 (Monoprice Ultimate) printable spools