Z max endstop issues

bread_bird

I have a Z max endstop set up on my printer. The entire homing routine works fine, but when I check what the printer thinks its Z position is afterwards, it says 300mm. From what I have read, shouldn't the printer assume it is at Z_MAX_LENGTH after it hits the endstop? I have this value set to 95 - nowhere near 300.
I am using Repetier Firmware with a RADDS board.

RAyWB

if you are talking about what Host shows after homing , be shure that Printer settings in Host match Firmware settings.

bread_bird

I was talking about what the firmware shows after I request the toolhead position. I have the Z height set to 95 in the host as well.

Repetier

Host also has a field homing position that you need to set to 95!

bread_bird

Sorry, should have clarified; I am using Cura, and I don't see a setting similar to the one you mentioned. I was under the impression that you could use a Z max endstop regardless of the host you used.
Would I have to use Repetier-Host for this configuration to work?

Repetier

I don't know why Cura shows what. That should not prevent printer from printing files. Homing still works just position cura thinks is wrong but absolute coordinates will still move correctly.

bread_bird

Unfortunately this is preventing me from printing files. Homing to the endstop works correctly, but the printer still thinks it has to move 300mm before the print starts.

bread_bird

I have switched to Repetier-Host just to make sure it isn't a host issue.
I homed the z axis, and as the axis moved it showed the position as 95mm. Then it hit the endstop, at which point it jumped to 300mm again. I pressed "set home" and position went back to 95mm, but this reverted to 300mm after I homed it again.
Because each print starts at z = 0mm, the printer believes it has to move from 300mm all the way to 0mm, and runs into the top of the z axis when it tries to accomplish this.
Hopefully you can point me to a firmware setting or M code that can help troubleshoot.

Repetier

Check your eeprom values.
z min = 0
z length = 95

is what it should say.
G28
M114
should show Z 95 then. Maybe you have not updated eeprom and only configuration.h?

bread_bird

Sure enough it was the EEPROM values that were causing the error.
I figured out how to set the Z max value, and now the printer comes to a stop when it should.
I remember on my Marlin firmware, you could change the configuration.h file and it would overwrite the EEPROM. Is there a setting in Repetier-Firmware that would allow me to do this?

RAyWB

https://www.repetier.com/documentation/repetier-firmware/rf-installation/<br/><br/>see section "The EEPROM Trap"

MartinH

Send to priinter
M502
M500
this will read values from config and store into eeprom

bread_bird

Awesome, the M502 is super helpful.
Thanks all for the information!