For a future project, i'll need accurate 3D prints.
To test outside dimensions I printed the 20mm hollow box from: http://www.thingiverse.com/thing:52946
Seems good to me!
A few settings were changed: reduced temps to 195° and flow rate to 70%
The default values are a bit too high.
Made my LED matrix interactive.
More info on my projects page
A video about the making of my 10x10 RGB led grid.
Testing a 10W RGB LED
Constant current driver on prototype pcb.
Arduino UNO with PWM program.