A strong corner piece for building frames out of 2020 Aluminum extrusion. Each of the three pieces joined together by the part are contacted by three screws each in a triangular pattern. The part fits into the extrusion's slot for a tight secure fit. The screw holes are for M4 screws with hex socket head caps, there is a 2mm counter sink on each holes. One of the screw holes is for an M6, the hole on the end of the extrusion must be tapped for this.

General Specs:

• Print at 40% for Strength, PLA is fine
• Layer height at 0.2mm for screw hole/countersink accuracy
• M4 Metric Screws with 2mm Countersink
• Channel slots for tight and square fit
• M6 Metric screw for extrusion end tapped hole
• Each Aluminum piece is contacted by three screws in a triangular patter for max rigidity
  UPDATE 1:
  I have added two additional models, one is the same part but the hole for the taped hole of the extrusion is left out. The other model has a cube in the corner and also lacks the hole for the tap as it is unnecessary. I haven't printed them yet but They are nearly identical to the original model, in OnShape I just duplicated the parts and adjusted parameters, Parametric modeling FTW!

UPDATE 1/23/2020
This part/this thing is now obsolete!!! Newly updated version of all these parts plus new ones at this new thing: https://www.thingiverse.com/thing:4117326 come check them out and print them, tell me what you think!