High Flow Fan Shroud for Printrbot Simple Metal

This fan shroud was designed to be:

- Easy to print at .3mm.
- Reliably and quickly rendered (no odd geometries)
- Very open for air flow.
- Aimed at the hot-end and the print.
- Not damaged by heat or bad prints.


General Repetier settings:
Layer Height: .3mm
General print speed: 70mm/s
Retraction per move: 2mm
PLA Temperature: 190deg
Extrusion Multiplier: 1.15