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Printrbot LC and LC+: Y Bearing Guide for GT2 32 teeth pulleys

by gyronictonic, published

Printrbot LC and LC+: Y Bearing Guide for GT2 32 teeth pulleys by gyronictonic Sep 3, 2012
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Summary

Upgraded to the Gt2 32 teeth pulleys and only to realized they don't fit at all. Designed a new Y bearing guide that offsets the 608 bearings back a few to make everything fit.

By all means, go for a 18 or 25 teeth instead, don't make the mistake we made!

Instructions

Print

  • Y bearing guide
  • Y bearing roof
  • 4 x M3 10mm long

Important
The M3 x 8mm bolts that came with the Printrbot won't reach the mounting holes so M3 10mm long bolts are needed.

The inner diameter holes may come out smaller than sized either from shrinkage or Slic3r gcode making inner diameter holes .5mm smaller. Some sanding will fix that.

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I always wondered: do you see a better resolution with bigger pulley wheels as the "polygon effect" decreases?

I made one of these things. it worked but i had to make a second one while i learned on the first. tips: gently sand down the bearing posts so the bearings fit easily. do not force the bearings when sizing because it can get stuck enough that trying to get it off will break the post. don't try and glue it back together. you have to carefully drill out all the holes slightly smaller than an M3 bolt diameter. then you have to work on the counter sunk holes for the cap heads. i had a mototool and rectangular burr so it was pretty easy. i used 16mm M3 to hold the bearing cap on. carefully screw them in slowly. if you mess up a base hole, you can just drill it out the size of the cap. ideally you want at least the two bolts under the bearings to be pressed into the counter sink. i think if you mess it up you should just reprint until you get it right. then, make another one just to be safe. its in now and it works great

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