Nearly identical to this: http://www.thingiverse.com/thing:296971/ But it's 140mm tall instead of 100mm. The instructions said to scale it to 140% if I wanted it taller, but I didn't want it to be 40% thicker too, so I changed it to be 40% taller while remaining the same thickness. The gap for the crossbeam is the same size, so download the crossbeam from the original model: http://www.thingiverse.com/thing:296971/