My TAZ 5 started acting up. I had a hotend jam. After removing the nozzle, cleaning the hotend and reassembling it, I restarted the print. I have printed this same GCODE file multiple times (at least 10) but this time something very weird happened.
The printer homes correctly (and if I manually home it works fine). However, after homing it moves up ~5.5mm (measured with calipers) before starting to print (on thin air, of course). I took a video but it doesn’t show too well, I’m attaching it and the gcode file anyway. This happens regardless of if I print via SD Card or via USB.
The file looks just fine on this end, I don’t see a Z travel adjustment. I’d check for something in the software itself, possibly the Z starting offset got a number typed in it when you were changing something else, possibly you added some startup gcode somewhere? Beyond that I’m not sure what to tell you. I have seen that before though. A printer I owned did that once, I ended up having to reinstall the control software. I’m pretty sure that was due to a setting and i just never tracked down which one it was, but that was very early in my 3d printing career. Also on a slightly different printer using about the same firmware on a Ramps instead of a Rambo board.
If it’s doing it from the LCD, there might be a weird offset somewhere in firmware. Check and see if the z offset in the LCD is set something weird. If not, then maybe switch the firmware out.
I found the problem. The G28 Z0.600 made the toolhead go slightly up… but my X axis somehow moved so it wasn’t parallel with the bed. When it got to the printing position it was high up. I really don’t know how that might have happened since, while I will sometimes move the X and Y axis by hand I always use OctoPrint to move the Z axis. Anyway, manually turning the right threaded rod until the X axis was level fixed it.
BTW, since you mentioned flashing the firmware… what’s the latest precompiled version of Marlin for the TAZ 5? I have 2015Q3. Would you happen to have the config.h available so I could compile and flash the latest Marlin?
Glad you got it fixed. There is a project in the development forum that has the latest marlin build pre configured gor a 5. Configuration.h is available in devel.lulzbot.com.