It could also be wiring problem. When you swap the board around the connectors and cables get moved around and they are working again. Have you tried to wiggle the connectors and cables when the gantry is moving to see if that has any effect?
I've also had some random stalling problems after assembling my machine and they turned out to be my bad crimp connections.
Hmm my flying extruder mount is definitely putting some sideways forces to the arms so i guess that the PLA got slightly soft and that made it to warp. Gotta revise the mount again and swap the arms ?
I recently enclosed my delta to print ABS better but my mag arms with PLA ends got warped pretty soon. I ordered a new set of delrin ended arms which should stand the heat a lot better but i noticed that they seem to have a printed insert between the delrin end and the carbon tube. Do anyone know if the part is indeed printed and if it is, is it PLA or ABS? Or do anyone have experiences running the delrin arms on enclosed printer. I really don't want to waste another set or arms.
Yep, made that mistake too. After upload the web interface just disconnected for no obvious reason and i couldn't connect back. Did a reset and uploaded again for like 5 times before realising that my slicer saved the gcode to different directory 
Oh yes good point. Thanks for that. The exit hole is aligned with the nozzle but the airflow itself goes behind the nozzle. Gotta reprint mine now. Also have to make a slight adjustment on where the fan exit meets the shroud
I too have been experimenting with different blower fan mounts. I tried my design with 40x40x20mm and 45x45x10mm blower fans but these seem to be just a little too big to fit on the effector assembly and to not reduce the printing area. I just got the shipment for the Gdstime 40x40x10mm blowers and adapted my design for those. I already printed the parts but haven't yet had time to install those, so they might or might not fit 
I'll post more pics after i try these.
