Spool holder for Reprap Prusa i3 branched by Isermt with acrylic frame (Frame support)

Isermt (宁波爱用) branched Reprap Prusa i3 and using 8mm acrylic instead of aluminum.
On the frame there's also 2 extra M3 hole to screw.
Thus I modified the normal reprap spool holder for this printer. I also made the code customizable so if you need different thickness of the frame, you can use Thingiverse customizer for you.

I only provide the "frame support" here. You'll need to print the "bearing support" from original version http://www.thingiverse.com/thing:68329