This is a remix of the Fleishman Puzzle by plastic, based on the work of Gregg Fleishman.

The only changes are that the OpenSCAD file is Customizer-friendly, parameters can be changed independently without affecting other parameters, and the tolerance parameter is now an absolute value. Moreover, it shows the correct solution in animation mode :)

You need 6 pieces. I recommend to start with two, to check if they slide into each other easily without being too loose. Print the remaining four once you have dialled in everything to your liking.

As with the original, the OpenSCAD file can easily be modified to produce a laser cutter profile, see the comments in the file.

The ready-to-use STL file has a thickness of 1.85 mm and a tolerance of 0.15 mm. This should be OK for well-calibrated printers, although you may want to adjust the thickness to match your layer height (including possibly thicker first layer). Avoid squishing your first layer too much, ideally it should have the thickness you specified in your slicer.