Geeetech

The parts that are bent are the M8*L300mm Z-axis threaded rod (part #4 in the part list).

It's the 8mm x 300mm threaded rods (vertical rods). One side wobbles a lot more than the other side. I'm pretty certain that it's the rods that are bent, and not a problem with the couplers.

Acrylic I3 Pro B

I'm not sure if my rods came slightly bent, or if the milling on the couplers isn't quite centered, but I am getting a wobble on the extruder head of about +/- 1mm from side to side when the Z-axis motors are moving the extruder head up or down. Has anyone else encountered this? How did you correct ...

That got it! One of the connectors wasn't crimped correctly. I tightened it up and attached it back to the z-axis end stop and it is now auto-homing correctly.

Thanks so much!

Ok, I have part of the problem solved. I changed the following line in the firmware to true (previously was false) as directed in some of the other posts on here.

#define INVERT_Z_DIR true // for Mendel set to false, for Orca set to true

Now the auto-homing is going in the correct direction, but ...

Thanks! I managed to get the firmware to compile and upload this time. However, after restarting the printer, it is still doing the same behaviour on the Z-axis. It appears this firmware isn't right either. What can I do now?

Is the firmware available for download anywhere? I tried the one that was posted in the Extruder forum, but it does not compile. It says that "Liquidcrystal does not name a type". It seems that LiquidCrystal.h is missing from the download.

I've just finished my build with the I3 Pro B acrylic printer with a GT2560 controller board. When I auto-home the stepper motors (either from within Repetier or from the LCD display), the X and Y steppers go the correct direction, but the Z axis stepper motor moves UP (away from the heater bed ...