I liked the design of rounded top of this piece, but since it is printed with the rounded part on the bed, it could not print correctly. If you dont have any problems with bed adhesion and if you dont mind to do some small postprocessing, print the round one (as I did). Otherwise print the flat one.
Original model hole is 15 mm deep. I eddited it to be 18 mm. Also adding this version here.
I'm also adding .step files if you want to make some adjustments.
I used the same setting as the original does:
15% infill, minimum 3 perimeters, 0.25mm layer height, 6 top and bottom layers
PLA/PETG shoudn't matter. I used PLA.
Printed upside down (on the stand of the longer side) for both, round and flat connector.
The author remixed this model.