Laser cut bushing holder for SAE Reprap Prusa

I made this in acrylic, cut on a laser cutter, to hold bushings for the Reprap Prusa I am building. The brass bushings have an interior diameter of 5/16" and an exterior diameter of 0.439", which is the same as the
diamater of the nearly circular hole in the center of this part. The part was drawn in Corel Draw,
based on information in the SCAD source file pla-bushing.scad. Basically, I only needed a cross-section of the Reprap part and so could ignore the Z dimension in the SCAD file.

Tw