Height adjustable feet for IKEA LACK table

I was not satisfied with my first design of the height-adjustable feet ([thing:3035217](https://www.thingiverse.com/thing:3035217)). Technically they work fine, but optically it looks strange.

I also wanted to put the table on wheels, which wasn't possible with the existing feet. New feet had to be added. They should have a square base to which one can attach wheels, but still be height adjustable. This is how the current model came into being.

As with my version 2 of the first design, the