Triangle Square

thingiverse

Added 50mm to the object, so you no longer need to rotate it in the slicer. Also made it a bit bigger for better precision. A simple three-sided triangle thingie is used to check that your frame is square on your printer. You can use a box or anything else, but this uses less filament and time, and it looks cooler. A little write-up on how to check with this and what having an out-of-square printer can do to your prints is also available at 3dprintingllama.blogspot.com/2017/04/square-is-as-important-as-level.html