This is a motor mounts for the 3DR Simple I removed the hole where the extrusion normally goes so now anyone can just boolean out any size or shape replacement they like.

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https://www.google.com/+DenzylBasterfield
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Link to the 3DR simple
http://trains.socha.com/2013/11/building-3dr-simple-delta-printer-part-i.html

Also going to add one that I made for my Build

The creator of the original 3DR
http://richrap.blogspot.com/