Positioning/Calibration errors after firmware upgrade

[DLS3141]

My apologies if this has been answered before, but I can't find it.

I just upgraded my Rostock V1 with Repetier 0.91 firmware downloaded from SeeMeCNC's Github. It seemed OK until I tried calibration.

Sending G28 from the console in MC it went to the top just like I expected. I then followed the procedure in the manual to set the Z height…so far, so good until I looked at the new Max Z height written into the EEPROM…719.54 mm. Previously, it was about half of that. I tried lowering it with a console command, but that crashes it into the build plate. I moved it to X90 and it only moves about half of that. Clearly something is amiss.

I was previously having good success with Repetier 0.82

Any ideas? Thanks in advance.

[KAS]

When you set the overall z height from the LCD, you need to home the towers before manually lowering to the appropriate Z-Height.

Make sure you are disconnected from MaterControl when you set it via the LCD on the printer.

LCD:
1. Home Towers
2. Z position ( lower to correct height)
3. Set new Z



I hope I'm understanding the issue correctly.

[Mac The Knife]

Looks like you need to change your steps per mm,,,, The older boards only use half of the microstepping of the later version boards.

[Mac The Knife]

Open up your congiuration.h file, and in the first 130 lines are the changes you'll need to make,,,,, I assume you'll have to change the pulley tooth count from 20 to 15, and you'll have to change micro_steps from 16, to 8. I am not sure about changing the pulley diameter.

[DLS3141]

I'm pretty sure the pulleys are 20T, I recently changed to the all aluminum ones and it was working fine that way.

The micro_steps being a 2:1 ratio, it makes sense that it would double the Z-height that the machine thinks it's at.