catapult
thingiverse
A personalized adaptation of http://www.thingiverse.com/thing:74322 has been created using the Customizer at http://www.thingiverse.com/apps/customizer/run?thing_id=74322. For printing, set layer height to 0.2 and print with 12 layers. The image file used is lithopane20131119-26144-1veqmcn-0.dat, and the hole diameter is 10.
Download Model from thingiverse
With this file you will be able to print catapult 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 catapult.