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
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2017-09-20 21:45:26 -04:00
2017-09-20 21:45:26 -04:00
2012-08-27 19:48:43 +00:00