Web Spider 85mm fridge magnet

Cut a 8mm x 3mm hole in tinkercad
I got 100 of these magnets from dealextrem, stacking 2-3 of them make them CRAZY strong.
http://www.dx.com/p/8x-1mm-ndfeb-neodymium-magnet-circular-cylinder-diy-puzzle-set-silver-100-pcs-219204