My old 8mm screws are normal 1.25mm pitch. Now i buy 2mm led screws, they work but when i change step per mm to Smoothieware that not match at all.
My old step per mm value is 2560. Now i update that 2mm led screws and i update that value to 1600, like prusa calculator says.
I douple check M92 command and printer own display that use now 1600 step per mm. I tested and put command to octoprint 10mm z axle up. I measured and that moved 40mm.
Of course i can divide that and get right number. But i thinking why that prusa calculator value is that badly wrong or do i have something my printer what i not get now?
I only change lead screws. Motors and all electric is totally same.
Before hand big thanks all what can help me with this weird problem.
Microstepping 16. But same 16 microstepping of course old screws too. I divide that 4 and get 400 step per mm put that in and print one 20x20x20mm cube and dimensions are perfect. But now that works maybe china is give wrong pitch or something like that.
You probably have 4 start 2mm pitch, so lead (total pitch) is 8mm. This is actually the correct way to specify lead screws.
PS. make sure to use correct layer heights with these, the calculator can tell you the optimal layer height, so you get even number of steps. Use 0.16, 0.2, 0.24, 0.28 etc, not 0.3!
If you don’t you can get z artifacts.
