This is a replacement for the printrbot base. It will prevent both the Z axis and the Y axis stepper motors from bending outwards.
The bending problem is shown in the picture(s) below.
There is an alternative version available which integrates a support for attaching the Y-stop switch directly to the base.
** update : uploaded a V2 of the stl with Y-stop. It contained a little error which gave a manifold error while slicing.
Download this version of the STL : http://www.thingiverse.com/download:109372
Just replace the stock printrbot base with this thing.
There is one version with a support to attach the Y-stop switch. Just put a wire-strap through the holes and zip on your Y-stop switch. (You need only one base with a stopswitch). See this brookdrumm printrbot instructional video to see how the Y-stop switch holder works : http://bit.ly/IWGBpP