Tank3D Triple corner 20x20 aluminum extrusion

Self align and self square triple corner for 20x20 aluminum profile. Part of [Tank3d Printer](http://www.thingiverse.com/thing:2040664) , many more things there, take a look.


Very strong, at the same time almost invisible as it is designed to have same thickness as neighbor aluminum profile.


Use it on your printer or enclosure for your printer