rounded bottom cup holder
thingiverse
If you've got a rounded bottom cup on hand, just attach its holder, and the cup will stay put without tipping over.
Download Model from thingiverse
With this file you will be able to print rounded bottom cup holder 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 rounded bottom cup holder.