Ball_Foot for D-Bot

The original is a great idea and a beautiful design.
However, last time I looked before today, parksddd proposed to replace the corner plates with it.
For me that was a step too far, I did prefer metal plates and these can be mounted with more force then I would dare to use with these printed ones.
So I decided to work around those plates.

Big disadvantage, compared to the original: these have to be printed with print supports.
I did that with Slic3r (in PLA) and that makes for a lot of cleaning up to do afterwards.
And not a very nice surface on the supported plane, but that is not visible when mounted.

Edit (29-03-19) Removed all the talk above about softer balls, I now use tennis balls, good damping, little swaying. I attached them after gluing the harder part of pieces of velcro (the hooks) inside.