{"data":{"model":{"id":"35714","slug":"low-friction-toms-easy-spool-holder-for-prusa-i3-m","name":"Low-friction Tom's easy spool holder for Prusa i3 Mk2/Mk3","authorship":"author","club":false,"excludeCommercialUsage":false,"price":null,"eduProject":null,"ratingAvg":"0E-10","myRating":null,"ratingCount":0,"description":"

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
\nz-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.
\n
Full assembly requires:
\n
2 Holder01.stl prints OR 2 spools_combined_TomMartin.stl prints
\n
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.

Print instructions

Category: 3D Printer Accessories Summary

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
\nz-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.
\n
Full assembly requires:
\n
2 Holder01.stl prints OR 2 spools_combined_TomMartin.stl prints
\n
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.
Print Settings
\n

Printer: Mk2.5

Rafts: Doesn't Matter

Supports: Doesn't Matter

Resolution: 0.25mm

Infill: 15%

Filament: N/A PLA N/A
\nNotes:

You can use Prusa's default 0.25mm settings and it will take about an hour to complete.

Adding supports will result in a cleaner surface to fit one of the bearings. Either way you'll have to clean out the bearing area for a good fit.

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Print instructions

Category: 3D Printer Accessories Summary

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