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Iris business card
Cardapult the Business Card Catapult
Trebuchet business card - Trebucard
Cardapult, Quicker and Easier Method
Very nice! Performs much better than I expected. A bit of advice: Don't use index cards (I learned that the hard way), and thin cardboard (think cereal box) works quite well.
Iris greeting card
3DOF Ball on Plate Using Closed Loop Stepper Motors
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