Read the description of the original and test print using just the man's foot - my printer/settings work for these size magnets with just a touch of glue (they press-fit but one popped out). I also glue the man into the frame and glue the outside frame to the inside frame.
Your mileage will vary with print settings and clearances.
I only used 10% infill and very basic settings with 2 walls, alternating a 3rd wall every second layer. 0.2mm layer heights but I'm tempted to do the man in smaller layers next time.
Have fun with colours - I'm going to try some translucents next time.
The author remixed this model.
I only modified/changed the magnet holes. This version requires three 10x3 magnets each man (six total).