Monoprice MP select mini extruder guide for TPU

UPDATE:
There is an improved remix of this at http://www.thingiverse.com/thing:1919259
which works better! Go use that instead :)

This is a sleeve/guide to prevent buckling of flexible filaments, and goes in the small gap between the extruder assembly and the start of the bowden tube.

NOTE:
In your slicer, turn it around by 180 degrees. There is a cutout cylinder at the bottom to match the bowden tube's input hole, and flipping it over will prevent any overhangs.