Since some of my friend dropped it and broken it in proximity of the ring hole, I've designed another version of calf which should be more durable. 

Some sort of chain is recommended, so the force when dropped is no directly on the plastic ring hole.

What you need

• A piece of M3 rod or a cut bolt (15 mm long)
• Epoxy resin or super glue.

How to print

For the calf you don't need support.

For the foot a little support is need around the ankle hole, like in the picture.

How to assemble

First when printing is done, screw the bolt rod in the hole of each piece to try and see how it is. Then remove the the bolt rod and put a little drop of epoxy resin in both of the hole, then insert the rod. If necessary clean the extra resin that come out.

Wait until the resin harden.

Done you now have a prosthetic leg key-chain !!