Printer Feet /w Stressballs

A nice set of feet for 3D printers and other devices that are built out of 2020 extrusions. They use a standard size stressball (+/-60mm diameter) and dampen vibrations from the printer. The universal model goes on any double-width 2020 extrusion with M4 T-nuts and M4x10mm bolts. Button heads recommended, but capheads also work. There is a second version specifically for the Ender3 V2. The rear of the frame holds the powersupply and this obstructs mounting of the feet. The E3V2 version is a foot that picks up on one of the powersupply screws and thus only needs one M4 T-nut and M4x10 bolt. I would advise to print them with at least 1mm thick walls. Material isn't very important since it won't get hot and pressure is spread over a fairly large surface. PLA will work. Example photos use Devildesign Dark Violet PETG.