Remixed Tool Bracket for Monoprice Select Mini.

Redesigned eburgess4's tool bracket to have tighter tolerances, Combined it with clayreimann's Tool Bracket to have only one open end to prevent tool holders from sliding all the way through, and then rounded some corners to make it less sharp and to follow the frame of the Monoprice Mini better. I am still fine tuning the filets on the corners to match the mini, so if you print it and have input please let me know. I will also likely add other tool holders as I think of things I need, If you would like to see something added let me know. If you print this out and like it, I would appreciate an "I made one".