Finger extensor exerciser

This is a simple finger extensor muscle exerciser. It may be useful for rock climbers for better balance between extensor and flexor muscles (I've seen claims that such a balance can help prevent tendonitis).

Print the top and bottom, and glue (or screw) together at the big central circle--I printed in ABS and using ABS juice to glue together. Then you can put a rubber band between the pairs of posts simply by bending the exerciser a little bit. You may need to loop the rubber band additional