I have bought a new trapezoidal spindel. And I need to change the Z-axis setting for the steps/mm in the firmware. I cannot find it, I tried to google it. I just cannot find it.
The new pitch is about 6 times steeper, if I tell the printer to rise 30mm it is alsmost at his top. The pitch is precisely 8mm/revolution
In which C or H file can I find this specific setting?
I just happen to have found it. In configuration.h use ctrl F to find this line: #define DEFAULT_AXIS_STEPS_PER_UNIT {64.25,64.25,2560,600}
The pitch of 8mm thread is 1.25, the new pitch is 8.00. So the printer now needs to make 8.00/1.25 = 6.4 times less steppes than before.
And 2560 [steps/mm] / 6.4 = 400 [steps/mm]. Change 2560 in 400 and you are set!
I am suprised in how I could not find this on the internet.
Hy,
take care of layers height now, with 8mm lead you can’t have all the sizes you want 
Also, this option should be now at false, #define DISABLE_Z because I had the problem of Z axis going down while printing, catastrophic results.
You can get the various layers size with the following link
prusaprinters.org/calculator/
[quote=“Tag”]Hy,
take care of layers height now, with 8mm lead you can’t have all the sizes you want
Also, this option should be now at false, #define DISABLE_Z because I had the problem of Z axis going down while printing, catastrophic results.
You can get the various layers size with the following link
prusaprinters.org/calculator/[/quote]
Yeah now you mention it, I already noticed that the pitch was so extreme that the spindel could slide through the special nut. I can indeed imagine that the entire extruder arm can drop like that when the motor loses power.
I see on that calculator that my prefered layer height of 0.4mm is not a problem. Also usefull tip.
Thank you for preventing my future headache, I will update the firmware first thing tomorrow.