Hello,
Thank you for your prompt reply.
I'm in Montreal, so I can source an arduino easily, but I think the bad solder is the best lead, because it would explain why by playing with the tightening strength it would go on and off (by bending ever so slightly the PCB).
So, how do I go about testing the solder joints?
If I cannot locate the faulty joint, is there a way to buy just the PCB without the arduino and the stepper drivers? €195 is a bit steep :(
I really appreciate your help!
Yves