by Zaggo, published
<b>[UPDATE 1</b>: Sorry, I just realized, that I accidentally used 80034 ball bearings, not 624 ball bearings for this design. I'm already working on a updated, new, better, nicer and prettier design, using "real 624" ball bearings. I'll publish this new design on thingiverse shortly. For more information on this, see http://pleasantsoftware.com/developer/3d/2010/04/22/the-power-of-reading/.]
<b>[UPDATE 2</b>: The new design is now available: http://www.thingiverse.com/thing:2473 ]
Ok, RustySpoon1121 beat me on this one ( http://www.thingiverse.com/thing:2318 ), but since my design is different (only 8 rollers, centrally mounted) and already finished anyway, I publish it as an alternative approach.
I use <strike>624</strike> 80034 ball bearings to mount the 8 rollers on the center wheel.
For more information on the project (and more detailed build instructions), please see my blog post at http://pleasantsoftware.com/developer/3d/2010/04/18/the-power-of-vacuum/
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For one Mecanum wheel, you need to print: <ul> <li>1 center wheel (either a left "Felge-links.stl" <b>or</b> a right "Felge-rechts.stl")</li> <li>8 holder parts ("Lager.stl")</li> <li>16 half roller parts ("Rad.stl")</li> </li>
In addition to that, you need (for one wheel): <ul> <li>8x M4x60mm bolts (alternatively, 8x M4 threaded rod, each 60mm long)</li> <li>8x M4 nuts (16x if you use threaded rods instead of bolts)</li> <li>32x M4 washers</li> <li>8x <strike>624</strike> 80034 ball bearings</li> <li>1x M3 nut</li> <li>1x M3 bolt, e.g. 15mm or M3 set screw</li> </ul>
For detailed build instructions, please see http://pleasantsoftware.com/developer/3d/2010/04/18/the-power-of-vacuum/