Tronxy X3 Upper Extrusion Endcap & Support

UPDATE 8/11/2017: A flaw was found in the model that seemed to appear when certain slicing software was used, specifically Simply3D. Thanks to Creat3DPrints for reporting this! This also affects the Tronxy X3 Legs Model So I am updating that also.

So my wife saw the legs I made and asked "What about the parts on the top? and if I were going to make new parts for that so it matches". I smiled and I said, "I am now" and here is the fruit of that conversation.

Corner brackets for the top extruded aluminum to match the legs I made.