Sock saver
thingiverse
Designed this to hold socks together as a pair through the washer and dryer. I hate unmatched socks. A similar item is commercially available but they are usually thinner and smaller, intended for thin dress socks. This will hold gym socks or crew socks. One has an added rim for additional strength, but the other one is fine for almost any socks. Printing: print in an elastomer like TPU-95A. 2 top layers, 2 bottom layers. Infill at 10% but I don't think it matters.
Download Model from thingiverse
With this file you will be able to print Sock saver with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Sock saver.