I wanted to share a solution I came up with mounting and tensioning the belts on this awesome project. It uses the concept from the corner block assembly by Tincho85 on Thingiverse, but doesn’t require new corner blocks or anything more than a 20mm nut and bolt on each belt mount. Check it out here on Thingiverse for a more detailed write up.
Full disclosure, my MPCNC is completed yet, but I don’t think I’m going to have any problems with this system.