This is a derivative of Chuck Murrays "Y-Axis Bracket for Solidoodle 2" (http://www.thingiverse.com/thing:36446) . I printed his originally but found they had a bit too much propensity to twist on my Solidoodle 3. The originals had a small 'lip' that hugged the case edges ensuring they stayed straight - so I imported Chuck's into Sketchup and added the lips. As a result, the 'overkill' versions are no longer ambidextrous. Included is STL files for dual copies of either version.
Printed at 50% hexagonal infill with 4 perimeters.
You will need to readjust the y-axis belt tension when you install this bracket. I also replaced my M3x0.5 button head cap screw because the bracket is thicker than the stock piece - I used an M3 phillips head screw that I had available. The stock 8mm long cap screw will work but a 10mm cap screw will ensure full thread engagement.