Change Z e-steps on UM3 in the firmware

[Chrborup 0]

Hi Guys

I tried ind the "Third party products & modifications" section, but seems more right here in the firmware section.

 

I bought a ballscrew for my UM3, instead of the supplied leadscrew.
The ballscrew has a much lower pitch, and i need to change the e-steps for the Z axis. 

Could any of you wise guys tell me how to do this? Maybe a little guide for dummies, or a link to a simular previus post 🙂

I tried googling for several hours, but with no luck 😞

[CarloK2 1]

The UM3 was designed very flexible and has most of these values stored in an internal configuration file. It requires you to set the printer in Developer mode and then remotely log in to the Linux prompt to modify the file: /usr/share/griffin/griffin/machines/um3.json 

The process is very similar to changing the E steps for people who upgraded the extruders. I'm lazy and redirect you to the Bondtech manual which explains this for dummies: https://support.bondtech.se/Guide/01. DDG For Ultimaker 2 and 3/16.html

See page 8 and further.

 

Instead of modifying the 'e' value, you, of course, will have to modify the 'z' value.

Note that the Bondtech manual is old, the screenshots have the 'X', 'Y', 'Z' and 'E' parameters in capitals, with later firmware versions changed those to lower case letters.