I love the magnetic build plate on my Anycubic Kobra Go, but placing it on the bed often required several attempts to get it straight. I designed these corner brackets in FreeCAD to make that alignment easier, then realised I'd need new bed spacers o accommodate the 3mm thickness of the corner bracket, so I added those to the set.

When I went to install them on the back of the print bed, I realized that the bed heater cable was in the way, so I mounted them on the front instead. It took a little getting used to, but they work pretty well, and my build plate goes on straight every time. These may or may not work with third party build plates - if your build plate is larger than the bed, you may need to make adjustments to accommodate. So I'm including the FreeCAD files for anyone who wants or needs to make changes.

Printed on my Kobra Go using Creality Black PLA+ at 0.2mm layer height. I used pretty high infill to ensure that the parts can't be crushed by tightening the screws. That was probably not necessary, but it still only took about 25 minutes to print the whole set.