I found the pedicure attachments shipped with the Beurer FB 50 foot spa too soft, therefore designed a stronger one.

The model is designed in a way that it only needs support for the inner ring and the middle point if printed with 0.2mm layer height or smaller. A 3mf file configured accordingly is also included.

I printed it in PETG with so many perimeters that it ended up with 100% infill effectively. I did this to prevent it from soaking up water over time and since it didn't make a big difference anyway.

I also attached the OpenSCAD sources, such that you can take the base and customize it with your own favorite surface. Just publish your modification as a remix here and optimally provide the modified sources as well for others to build on it.