Billy Olsen 3995a330da Add new material types for rail buttons
Add two new material types for rail buttons, delrin and nylon.
The material densities are pulled from wikipedia and cross-referenced
with Dupont's material database.

Additionally, set Delrin as the default material for RailButtons.

Closes #554

Signed-off-by: Billy Olsen <billy.olsen@gmail.com>
2020-03-02 20:33:56 -07:00
..
2013-11-11 09:51:53 -06:00