Here's the X-Brace center connector. I designed it to be split in half for ease of printing and installation. It allows you to have some leeway in the installation of the extrusions, so you don't have to painstakingly get them equal the very first time as you can adjust it to fit the printer's extrusions. it takes 16 M4 10mm screws - same as the ones for the robotdigg alum corners ( Trying to minimize the # of different nuts and bolts required.) It also has 2 M5 screw holes for a tighter compression of the braces ( not necessary), but really it's more for additional screw mounts for tool holders and the pan and tilt camera.
Also started on my PEI bed today!
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