Inspired by the existing bowls, I created a walnut bowl with a thread so that the skins do not fall out.
After turning, the upper bowl can be inserted into the lower one to save storage space.
The bottom cup is printed with X-Y hole compensation: 0.15mm so that the thread is not too tight.
Update: 17.3.2024
The material is not important, PLA is enough. I also printed PETG because I didn't have PLA.