CNC-able polycarbonate Y bottom thick plate (6mm)

This is yet another Y bottom thick plate
for the prusa mendel
Based on prusa's interaction2 design - blog.reprap.org/2011/11/prusa-iteration-2.html

This iteraction utilizes a simplified Y axis stack
- no top plate, just the PCB heated bed+glass stacked on top of the bottom plate using spacers


I wanted to make a bottom Y for my kit,
but Prusa's design for the lm8uu bearing holder is very different from what I have. - mine came with thingiverse.com/thing:7755

In this repository you can find the bed drilling template as originally designed:

github.com/prusajr/PrusaMendel/tree/master/metric-prusa-lm8uu

After asking TommyC about his printed single piece Y carriage,
(see comments section here: thingiverse.com/thing:23900)
I decided to use polycarbonate for the bottom plate, and supposedly
it can take as much as 140ºC before changing its dimensional characteristics - perfect for
keeping the Y simple negating the need for insulation. - check your polycarbonate supplier's data sheet
to check the temperature ratings - they can vary.

You can laser cut it or use a CNC.
You can find the gcode (emc2 mm arcs .gnc) for 3mm end-mills, 6mm polycarbonate plates and
very slow speeds to accommodate small desktop cncs in the files.

WARNING:
Check z depth in gcode file as I had to go 8mm+deep on my CNC machine, so you MUST edit it or have a sacrifice surface at least 2mm thick.

You should assemble your y smooth rods on top of the threaded rods, otherwise the plate will hit the belt pulleys.