For safe storage of double pointed knitting needles (15cm or 20cm DPNs).
It keeps them together and prevents stitches from falling off.

Depending on the adhesion to the build plate, it is recommended to print the holder with a brim.
nozzle 0.4mm with 0.2mm layer height.
Material doesn't matter, use what you like.
I print them with a wall thickness of 4.
The amount of infill is not that important, 10-15% should be sufficient.
No support required.