This is a rack for table mats and/or drinks coasters. I used to lean these against the wall at the end of my kitchen shelf and invariably knock the phone onto the floor when they’d fall over every time I reached for one. But no more!

These particular table mats are 225mm in diameter. The coasters are 108mm in diameter. Both are 8mm thick.

If you need only a rack for table mats or only for coasters, just “negative volume” the part not needed in PrusaSlicer.

Ok, so it takes a day and a half to print since there is rather a lot of 100% infill. Then again, what price a tidy kitchen?