For the Monoprice Maker Select Plus/Wanhao i3 Plus and similar. This is to be used without the stock springs to level the bed. This part goes between the bed and plate and allows finer tuning to the hot bed. It holds an M3 nylock nut (fits the stock screw/bolt).
Measurements are 5.4mm +/-.03 flatside to flatside on the nut and they will fit snug.
This is not a remix. I was not a fan of the other designs and my nuts didn't fit (lol). So I designed my own based off of all the others I saw. This it literally 5 shapes in Tinkercad. I like parts to be symmetrical if they are square measurements, the others were not up to my standards.