Summary

Swaps for the original wooden part so one can mount a small 40mm fan on the bridge for cooling the Printrbot's work!

Instructions

My version is a derivative of K1nc81d. Mine is a little more flat, more true to the original part. And it's done in Inventor so usable as a solid model. Either model will work on your Printrbot, i just like designing!

Be aware that i'm not yet done. Tomorrow a 40mm fan arrives, will test after that. Will also be making a 'left' version for double cooling power (not sure if it is necessary at all)...

A small error i've found so far: the top clip for the fan is in the way for the top-right screw. Just half a milimeter...

I drew this part in Autodesk Inventor, you can easily edit it and make your own!

Also i'm not sure yet about the height of the two fan clips. Check back for revision two in a few days!

Order a generic 12v 40mm fan, get some screws from your parts bin.
Print part and clean it up a little with a knife and a small file
Mount and connect to Printrboard
Enable cooling in Slic3r

That's it!

Printrbot LC fan mount