Custom Idler Bracket for RepRap Fisher Delta 3D Printer
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Idler bracket to take a small aluminium belt pulley.
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Replaces the original idler bearing carriage. Allows a pulley designed for 6mm belts. This prevented my belts from sliding off the bearings slightly and rubbing on the sides.
Pulley 8.5mm wide, 18mm diameter with 3mm centre hole. Advertised as "6mm 20T NO T 3mm". The "NO T" refers to the pulley being smooth with no teeth.
Each pulley requires:
1 M3x12mm bolt
1 M3 nut
I recommend buying a set of M2, M3, M4 bolts, nuts and washers in a variety of lengths. They are really useful for these sort of projects and it saves trying to buy small quantities one project after another.
Featured in my blog post about my Fisher printer:
https://www.tech-spy.co.uk/2026/03/reprappro-fisher-delta-3d-printer/