Low-friction Tom's easy spool holder for Prusa i3 Mk2/Mk3

Updated model:
https://www.printables.com/model/35714-low-friction-toms-easy-spool-holder-for-prusa-i3-m

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This is an upgrade to Tom's simple spool holder. I've added two 608 skateboard/fidget-spinner bearings to allow the spool to spin more freely around the 8mm rod. This reduces resistance applied to the extruder and may improve the accuracy of high-acceleration x-axis movements.

The drawback with this approach is that if the bearings spin too freely, the spool can unwind several turns if the x-axis movement is too fast. You can fine-tune the behavior using washers to apply slight clamping pressure on the bearing.

Four alternate spools are provided that will work with 99% of filament brands out there:

• 50mm with a 3-degree draft angle to keep the spool centered
• 50mm with no draft angle
• 30mm with a 3-degree draft angle
• 30mm with no draft angle

z-height of the spools is 96mm which will fit a variety of filaments and is the ideal size when combining Tom's spool holder with the top-mounted LCD holder.

Full assembly requires:

• 2 Holder01.stl prints OR 2 spools_combined_TomMartin.stl prints
• 1 spool print
• 2 608 bearings
• 8mm threaded rod (130mm or longer)
• 2 washers
• 2 or 4 8mm nuts (4 recommended to use as jam nuts to prevent vibration from loosening things up over time.