This is a clamp cover I made that goes on my $3 Harbor Freight 6 inch clamp. It holds two pieces of wood at a 90 degree angle making a corner. Which should make it easier to attach them.
This is the first design I have made that I'm actually sharing since others may find it useful.
I don't remember ABS
I used ABS and dipped it in acetone for the strength but something else may work just as good or better I don't really know.