So maybe a bit over ambitious for a Repstrap with no Heated bed but I had a go anyway.

I really like the UP! Bearing - get it here - http://www.thingiverse.com/thing:3981


Not a bad start - Poor choice of infill size - too many start-stop operations

Starting to warp on the front edge - Note my use of double sided tape! in an attempt to counter the warp.

At this point the warp was going to destroy my extruder, so I reluctantly had to turn it off. You can see the bottom front edge getting more and more melted after each pass.

All the bearings are clear and I think would have moved and worked if I could have printed it all.

If anyone has a Mendel with a heated bed, I would love to see if this could be printed and if it worked afterwards. - Let me know if you try it..

If you want to try - You will need a support structure -
I made a 1.7mm high ring positioned under the balls to get them to the correct height in the bearing. For me the balls started to print after layer 4. The ring needs to be 58mm outer and 46mm inner. - Good Luck !

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[richrap.blogspot.com]

Just a quick update as I re-started this print (By hacking 27 layers out of the GCode) and it all worked ! even with a bit of warp!

So I now have a cool 3D Bearing -

See my blue line -


And it rotated 180 degrees -


I tried printing one 50% smaller, but that was a failure, I expect 200% would work great!

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[richrap.blogspot.com]