Thanks to ClassyGoat for designing this awesome playset.
(https://www.thingiverse.com/thing:772378)
Sadly i didn't have the right magnets and am nowhere near the us, so i remixed the project to fit 6x2mm magnets and while i was at it i made the holes parametric so that you can make the set fit the magnets you already have, just change the values for the hole diameter and the hole depth in the spreadsheet file and export each of the parts as an stl. You can also modify tolerances as you like.
I also realised the parametric holes allow to scale the model up and down without loosing functionality.
I only modified the already existing holes so there are limits to how big you can make the holes. Watch for parts of the holes piercing through when increasing the size.
The whole set take 52 magnets.
Worked over the project and now it works as intended including scaling down the holes from the original and going up to 6x3mm. Also everything is now in one Freecad project.
The author remixed this model.