Penny trap
thingiverse
Penny catchers wait until print job stalls, then drop in penny, followed by restarting process, and they'll likely find their reward is not what they expected.
Download Model from thingiverse
With this file you will be able to print Penny trap 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 Penny trap.