Paperclip
thingiverse
I needed a paperclip for a larger stack of papers (10-50) and was surprised that I couldn't easily find one on this website so I designed one and it works great, I thought I would share.
Download Model from thingiverse
With this file you will be able to print Paperclip 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 Paperclip.