I get your point Paul.
But after all the work I hate to give up.
I'm searching the net to see if I can find a large cog for the motor with 5 mm bore that could match a 4 mm bore cog for the gear. Underneath each gear I have placed 2 ballbearings to help smooth their turn and keep them in place.
But the biggest problem remains allignment.
Not really. If I could manage to control all the steppers in synch with the same signal (with help from you guys) then I could have a large hidden disc with 10 or 12 magnets for the sensor stops. No homing needed, just stop at different patterns. Am I wrong ?