I created this thing to make my heat-bed of the Zonestar P802QR2 more steady like the Original Prusa i3's by Josef Prusa. The printer comes with the standard spring spacers on those long M3 screws and adjustment wheels that you can use to level the bed. I experienced much movement when i was printing fast so i tried to come up with a solution and it works pretty good. Just print the 4 little parts and place them over your springs on the M3 screws in the corners of your heat-bed. Then lower the heat-bed in place again till you can't turn your adjustment wheel anymore. Be careful not to overdo it because you can damage the parts as they are quite thin. After that just level the Z-Axis with the screw on the backside of the left X-axis carriage. If you build your printer correctly it should be fairly level.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/docdXieXw61
Print with PETG or ABS to prevent weakness of the parts. The Heat-bed becomes hot and material like PLA can't handle the heat. Also use 100% infill to make strong small parts.