Inspired by several Brackets on Thingiverse, I decided to design my own. These brackets might be a bit overkill, but I really wanted something heavy duty and with good stability. I also eliminated the inside corner brackets at the top of the frame and replaced them with gussets. This allows extra travel on the Z-Axis. I included a calibration thingi for test fitting. Thingis were designed with absolute dimentions (20mm x 20mm, 20mm x 40mm inside and 5mm walls). If thingis don't fit perfect, do not scale up or down. Instead, import STLs into your favorite cad software and modify accordingly. If you make one, please post pictures. If you upload modified STLs, please include dimensions. Enjoy
Printed with 3 perimeters walls and 8 top/bottom layers. Use Brim if you have warping issues.