Squash Ball Feet for 3030 and 2020 Extrusion

I just needed some dampening feet for my Hypercube Evolution with 3030 extrusions but only found designs for other printers.
Therefore I remixed the squash ball part from bullet86 with the 3030 extrusion feet from sixfeetunder. Thanks to both for their fabulous designs.

By request I added a similar one for 2020 extrusions. Please note that I haven't printed it yet by myself as I do not have any use for that format. Give it a try and let us know in the comments whether it fits the 2020 extrus