This is a modified version of jamimr's pocket hole jig. I added adjustable depth slides to each side.
All parts require supports. I used the "everywhere" supports setting in Cura. I printed this in ABS and found a brim was useful to help prevent warping. Slides should be printed upside down to their final orientation.
Clean of supports gently. For the metal insert use 2 1/4" copper coupling and soldering iron to heat set them into the holes.