This is just a simple rack, for storing your knitting needles. There are three holes in the top, so you can mount it with whatever you choose.

The holes are (or should be), different diameters for different size pairs. Depending on print orientation you may have to drill out the holes a tad bit so needles will fit.

This can be printed with PLA or any other material however you may want to choose a stronger material (i.e PETG) for strength of rack.