Guess who forgot to insert a couple of T_Nuts on a big build,
Got lucky with this one first print and it was spot on for my 2020 profile with a 6mm slot not quite perfect but damn good, will tune and upload any improvements, 3mm hole is tight to aid input part turn in slot with a long screw then finish 90% turn with long nose plyers.
Murphy must have been having a tea break with this one, knocked up in Tinkercad in literally 10 minutes and printed and used withing the hour, if only everything worked so easy.
0.1 to 0.2 finer the better
I didn't use a raft to save clean up printed onto masking tape with Brim 1 layer 9 wide to make solid base, very little contact with bed so printing without Brim or Raft would be FUN (Not)
Also printed slow and fine lifted off and stored on tape.