Qidi X Max 3 XY Belt Tensioner

The version of the X Max 3 that I have has the automatic tensioner. My belts were way too loose with no way to tighten them. This is my solution. It reuses the inside plunger and the spring. All you need is an m3 screw and nut. Replace the original housing with the printed one. There's a spot for the nut inside the housing. I used a long m3 to push it into place. Thread an m3 from top into the nut, drop the little plate in, then the spring, then the plunger.