Geeetech

Hi Friend,

I just finish assembly my i3 3D printer. I suddenly found problem. My printer cannot home and Z-axis cannot move both up and down. I checked jumper for motor driver. They are correctly set for A4988 chip. My main board is GT2560. I test by swapping connector of Z to X axis, it work just fine when I move it by manual control from Repetier (I use Repetier V1.60). My other axis work ok.
I did another test by disconnecting screw rod out from motor coupling and found that motor can move, but it stop easily when I hold it with my hand. I test again by disconnect one of z motor from main board, now Z motor can rotate and I cannot hold it with my hand. I try to swap motor driver A4988 from another slot, but result is the same.

What did I done wrong? Pleas help asap.

seems your Z axis is lack of power, you can try to increase the voltage since it has two motors to drive, check this link here:
http://www.geeetech.com/forum/viewtopic ... 13&t=17038

Hi Mark,

It does not work. I checked voltage, at first it was 0.8 V. I turn it to be 1.2 V, but result is the same. I check all of the rest driver, they are all only 0.8 V. I check all voltage to stepper connector, they are all 12.67 V. What should I do next?

Hi Mark,

I finally make it work. Problem possible come from lagging of stepper power when they have to share the current. I remove one of top holder out and now both of them can turn, I will figure out later how to make the mechanism better. Now I can also do the auto homimg. I found out that end stop switch was wrong connected to be "NO" instead of "NC".

I found another problem. It seems to me that X axis was going to wrong direction. When I do the homing, extruder will move away from end stop switch. I install end stop switch on the linear guide at the left side according to the instruction manual. What did I done wrong? Can I just swap the end stop switch to another linear guide side (to the right side)? Will it mess coordinate system of printer and software and result to wrong printing?

change the direction as the link shows:
http://www.geeetech.com/forum/viewtopic ... 13&t=17037