This thing was made with Tinkercad. Edit it online https://tinkercad.com/things/iQQgeBA2LVT
Corner clips for Printrbot Plus with heated bed and glass. Short enough to clear the z carriage.
Pics are of the item, how little the clearance is, three of the most recent prototypes (showing how thin the 'top' has to be), and a number of my earlier versions and mangled prints.
This is my first project I've done and published.
Bolt is a 3mm flat head (pan?) screw from True Value. It has a hex key in the head.
Printed on a Printrbot Plus V2 in ABS at .1mm height