Gimbals with letter

Gimbals with a letter in the middle.

All letters are more or less fitted and centered, but you may want to adjust them further using the .scad and OpenSCAD.

TODO:

allow more than 4 rings
fourth ring a little loose
allow attaching gimbal sets together, or a gimbals stand

See also:
http://www.thingiverse.com/make:90021
http://designmaketeach.com/2014/05/06/3d-design-personalize-a-gimbal/