This is an earlier design that I had for the Iris Business Card. It has a slightly different build that allows for more than 3 leafs.

This is an iris mechanism built into a greeting card sized card (5" x 7"). For simplicity and to help keep the thickness low it only has 3 leafs. This particular design does not scale well to more leafs unless it is made much larger. The initial design did have 4 leafs and is built in a way that would allow it to scale to a different number of leafs more easily. If anyone is interested I could upload that as well.

This card has slots in the back that allow you to stick a 2" x 3" photo in the back and reveal it when the iris is opened.

I have this setup for 8.5" x 11" sheets, but if you have a bigger sheet you can combine the two files.

This is an iris mechanism built into a business card sized card. For simplicity and to help keep the thickness low it only has 3 leafs. This particular design does not scale well to more leafs unless it is made much larger. The initial design did have 4 leafs and is built in a way that would allow it to scale to a different number of leafs more easily. If anyone is interested I could upload that as well.

As the name states this is a business card sized device that folds out into a little desktop catapult. It can be used for launching various small objects.

Video of the card here: youtube.com/watch?v=rv8u7rttdBM

After making many of my original Cardapult design (posted on Instructables) I decided it needed to be revamped to make it both simpler and stronger. The axles were beefed up to 3/8" from 1/4" and the upper arm was lengthened and lightened for better performance. The legs were simplified to cut down on the number of parts.

This is a business card that shoots US pennies. It has a little magazine that pops up and allows you to load up to 10 pennies. Then you can just pull back the slide and release to shoot a penny, and repeat until all the pennies are gone.

A video of the card in action - youtube.com/watch?v=5KNZZ9qDJtQ