Summary

Just something :) the kid love.
It has 3 holes on the back to add magnets, 10mm diameter with a M3 hole. 3-5 mm width.
Suggest to print with support for the first 3 cm of the model.
Link to the fusion model: http://a360.co/2nqmbSB
Included the files to Autodesk Mudbox, which i used for adding some textures.