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Prusa i3 Y-Idler

by Jooxoe3i Sep 13, 2014
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It really works. I had started to have problems with the y axis when it reached its limits but this helped balance out what was wrong.

this looks very interesting.. would it work on a 8mm threaded rod if i scaled it down or would the geometry be all off?

hm, you-re probably better off recreating it, since the holes for the screw that connects to the bearing would also be scaled down = to small

note that while this design worked, i recently redesigned the y-assembly on my printer for an even easier way to tension the belt: /thing:1451003

reworked y-assembly for Prusa-i3 Einstein

If I get it correctly - you don't even have to "sandwich" it from the sides with M10 nuts/spacers, do you? Is it supposed to auto-center itself by being left to move freely on the rods to the sides?

yeah, i found that the plastic - under the belt tension - bites enough into the threaded rod that the whole idler stays put - so no need to squash it between washers/nuts

Great design. Any updates to this?

not really, have been using it as-is since i uploaded it last year :-)
might revise it at some point in the future though - since my printer is not using the full length in y direction due to the current belt/motor/idler setup

Nice idea. No quite sure what when wrong though. Printed this in ABS scaled to 101 percent and everything printed fine except the flanged pulley is actually smaller tham the bearing. Any ideas?

hm, try applying some force with a pair of pliers - and/or apply heat to soften it up a little; it was a tight fit for the one i printed (in PLA)