Autonomous Robot WheelRim fitting LEGO Technics axles

Next Step: I would like to try to print the tyres in Ninja-flex and base the design on different variations of the "Flexible Bracelets" such as: http://www.thingiverse.com/thing:13505

When using 0.2 mm layerheight the "rim" can be printed in 70 minuttes (60 mm/sek) and the core in 7 minuttes. Four "cores" + one "rim" can be completed in a 100 minuttes introduction to 3D-print.