IKEA Kallax feet

These are feet for the IKEA Kallax shelves. There are two models provided:
 - 30x30: Feet for a single shelf.
 - 30x60: Feet usable to combine two shelves with each other.

The size is 100mm, to make sure that a vacuum robot can clean underneath.

Update 2025-01-31
As requested, there is an additional version for increased stability available. This should improve the results for PLA prints.