Y shift 9 hours in!!

Check belt tension, mine used to do this right out of the box.

Fan needed on main control board?

I re sliced and sent the file to octoprint server.  It shifted in the same spot but this time on the x axis.

I made sure my octoprint software is up-to-date, and reset the Raspberry Pi. I reset the tension on the belts on the X & Y axis, as well as the belt going to the stepper motor for the y axis.

These were running at night, so the control board should not be any more hot than the ones that run during the day. I'm open to any ideas

I ran into the exact same problem with a X-shift mid printing at the same point the three times I tried it. Since it was happening in the same spot each time, I thought it had to anything other than the wires.

Long story short, it really was the wires to the X-stepper that had gone bad.

I replaced all the wires for the x-stepper and the x-endstop with some higher quality cabling, and changed the routing to something more like this: http://www.soliforum.com/post/119801/#p119801

500 hours of printing later and not a single x-shift has happened.

I ran into the same problems when changing from stock firmware to repetier 0.92!

The point is that the recommend speed settings that can be found in some forums are way too high! The natural behavior of a stepper motor that it has an upper speed limit where the torque is decreasing massivly and finally stopping the motor to increase in speed. If you run a stepper motor above this point it will simply skip a few steps as it can not follow the speed. This skipping of steps leads to an error in position between the machine and the software! This can happen to all axis and is a different failure than the one with endstop sensor (BTW - thanks for refering to my post)!

When I had this trouble I did some reverse engineering on the stock firmware/software to see what XYZ is choosing for the speeds. I assume that they know their machine well and did intensive testing for ideal speed settings.

The speed settings from the XYZ stock firmware/software with quality setting "good" are:

    Perimeters:     15 mm/sec
    Infill:               30 mm/sec
    Support:          45 mm/sec
    Travel:            45 mm/sec
    Retract:           30 mm/sec

I know that these settings seam to be quite lame compared to other machines - but that's what the stock firmware/software is using. You may can go 10% above but if your speed settings are 50% above these settings the trouble is for sure! If you want a faster print I would suggest to do a hotend mod http://www.soliforum.com/topic/14386/mo … avinci-10/ and change to a bigger nozzle diameter - I would not recommended increasing the stepper motor speed with this machine!

My son sold name plaque pencil holders at a mock market day at school.  Each name plaque was taking 5 hours, so I really pushed the speed settings and we could bust out 3 in 12 hours with minimal quality difference.

After a week non stop, they started shifting.

I don't think it's the wires, I think I just simply pooped out the stepper motors.

Went back to my slower settings and have had no problem since.

Yes it can mater. What you need to do is identify the pairs and connect them correctly according to the pairs. if you done you motors wont spin but will do the hokey pokey.

The colors of the wires don't mater but wiring the correct pairs together does.

With the Davinci stepper motor pin 1 and 3 are winding A and pin 4 and 6 are winding B.
so use a ohm meter to find your pairs.

If you don't have a ohm meter you can find the pairs by spinning the motor. first spin it with none of the wires connected. get a feel for the resistance. now pair one set and only one set  of the wires and spin the motor. if there is more resistant you have found a winding pair the other 2 will be your 2nd pair (assuming you using a 4 wire stepper motor)

one you have found your pairs you need to wire it up and so winding a (chose one) is connected to pin 1 and 3 and winding b is connected to 4 and 6.

If you get it backwards it will spin the wrong way. Not a big deal just swap the pins or change it in firmware.

In my case it was not the wires itself - it was the JST connector. The connection is not very reliable especially when you have vibration. This mechanical stress is much higher on the x-axis than on the y-axis. But there is a chance that due to vibration of the complete machine also your y-axis connector be affected. I suggest to remove the connector and directly solder the wires to the sensor PCB for x AND y-axis!