I’ve recently finished building my Kittaz and am in the process of calibrating it. Unfortunately, I’ve run into some issues which hopefully can be addressed here.
When testing the printer upon turning it on for the first time, I noticed that the Z axis motor on the lower left would rotate fine when no load was placed on it, however, when attached to the Z rods via couplers, it would not rotate, causing only the right side to rise. This resulted in a horrible grinding noise but fortunately the whole assembly is pretty robust. After some playing around, I finally tested the circuit for continuity and noticed that the black wire which powers the lower left z motor was broken. The wire appeared to have broken off from the pins located inside the CB YZ Harness. In a rush to fix this, I accidently crimped the wire to the wrong end of the pin (after pulling it out), basically rendering it useless. Ultimately I ended up pulling the black wire for the lower left Z motor from the YZ Harness and attaching the two directly to complete the circuit. After doing this, the motor worked great. This leads me to the problem: I need a new YZ wire harness and CB YZ wire harness or the appropriate pins to restore it. Where can I find these?
When calibrating esteps for the extruder, the instructions located at  say to enter m501 into pronterface to see the current esteps. Doing this returns no value in pronterface or repetier host. In order to update the esteps, I had to reflash the firmware. Currently its at ~746 but still appears to be slightly underextruding by 2mm when 100mm of filament is extruded at 100mm/min. When printing it looks like there is a bit of overextrusion which is strange (picture below). The bed is level as confirmed by printing the gcode located at  so the appearance of the print probably isn’t caused by the nozzle touching the print. The left (blue) print is made on a calibrated printrbot simple and the right print (white) is printed on the Kittaz. The calibration cube printed on the Kittaz is much more blobby and stunted. Is this the result of miscalibrated esteps? Also is there any way to change the value of esteps via command rather than reflashing the firmware?
As you can see in the photo below, the calibration cube printed on the Kittaz is also much shorter than the blue one. It measures at 17.14mm in height rather than the 25mm it should be. The x and y axes are printing at the correct dimensions (each small cube should be 5mm X 5mm X 5mm). Is this the result of miscalibration on the z axis? I read here previously that only the extruder motor (esteps) required calibration and adjusting from the default 800 value.
Prints which require modest amounts of retraction cause the (3mm) filament to stop feeding resulting in a ruined print. I have tried retraction settings as low as 1mm at 10mm/s which has improved the problem a little bit, but not completely. I’ve attached a photo of what happens to the filament when this occurs below. There is no resistance felt when manually pushing the filament through the extruder into the hot end manually. I’ve also played around with the tension on the filament quite a bit but this didn’t seem to help. Any ideas?
I am currently printing using slic3r and pronterface using the default slic3r settings located at  and printing with PLA, although the results are almost identical when printing with ABS using the recommended settings.
Please let me know if you need more info.
For 2 and 3