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

thingiverse

This upgrade takes Tom's simple spool holder to the next level by adding two 608 skateboard/fidget-spinner bearings, allowing the spool to spin more freely around the 8mm rod. This reduction in resistance applied to the extruder may improve the accuracy of high-acceleration x-axis movements. A drawback of this approach is that if the bearings spin too freely, the spool can unwind several turns when the x-axis movement is too fast. To fine-tune the behavior, you can use washers to apply slight clamping pressure on the bearing. Four alternative spools are provided that will work with 99% of filament brands: - A 50mm spool with a 3-degree draft angle to keep the spool centered - A 50mm spool with no draft angle - A 30mm spool with a 3-degree draft angle - A 30mm spool with no draft angle The 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. To assemble this upgrade, you'll need: - 2 Holder01.stl prints or 2 spools_combined_TomMartin.stl prints - 1 spool print - 2 608 bearings - An 8mm threaded rod (at least 130mm long) - 2 washers - 2 or 4 8mm nuts (4 recommended to use as jam nuts to prevent vibration from loosening things up over time)