Arm support

My son broke his arm in a snowboarding accident and now has to wear a cast. He like playing computer games, so it is a bit hard for him when he can't freely use the WASD keys ;).I invented this support, and it works great. Maybe it will be useful to someone (I hope in different situation). Printing profile is rather for quick print (as can be seen in photo ;)) but goes fine with minimum supports with layout as in file.