This rotating knitting needle organiser is designed to organise double-pointed knitting needles by size, but can also be used to store crochet hooks or office supplies. It has twelve outer compartments and a slightly taller and larger one in the centre. If you don't need it to rotate, it can be printed without a base.
The outer compartments can hold a full set of 5 dpns (or more than one for smaller sizes) up to 6mm.
There is a version with knitting needle size engraved on each outer compartment, but it's made with the needle sizes I have, so you may want to customise it with different sizes. I also added the .f3d file in case you want to modify it to suit your needs.