This is the Bouncer, a fully remixable and fun model I made in blender. 

Stuff you will need

• 4 10-inch springs

• 2 1-inch springs

• Attachment stuff of your choice (I used wire, but you can use hot glue or a 3d pen)

Printing Instructions

• Use brim

• Scale all the parts to 2000% scale, except the feet, scale them up to 2500% (for some reason blenders scale is weird).

Assembly Instructions

1. Take the springs (The longer ones) and attach 2 of them to the arm sockets, then take 2 and attach them to the bottom of the lower torso with your method (If your using wire then wrap it around).

2. Take 1 of the smaller springs and attach them to the top of the lower torso, then take the other one and attach it to the top of the upper torso.