Thumper
thingiverse
For those who prefer thumpy over stingy. will leave bruises. use with caution. I'm not responsible for how you may use or misuse this device.
Download Model from thingiverse
With this file you will be able to print Thumper 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 Thumper.