Z axis issue

Hi all,

I am using my custom designed 3D printer based on Prusa i3.
RAMPS 1.4 + Arduino Mega 2560.
belt driven X & Y axis.
M5 0.8mm pitch driven Z axis.

For the value of 4000 if I print 10 mm cube I get 8.5mm.

#define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,4000,645.058567}

But When I modify it for 4500 I get 12.5mm.

Did anyone faced such issue.

Let me know if I missed any info.

If you have a 200 steps per revolution stepper motor, 16X microstepping on your RAMPS board, and are directly driving an M5 rod with 0.8mm thread pitch, then 4000 is the correct value for steps per unit in the Marlin config.h.

It sounds to me as though there may be another issue there with your Z axis travel, possibly an issue with missed steps.

@ supraGuy,

How to deal with missed steps??

missing steps : pololu's power is not set properly

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Collective intelligence emerges when a group of people work together effectively. Prusa i3 Folger (A lot of the parts are wrong, boring !)

You mean the volt value on stepper drivers?

Yep, the output power maybe a bit low. Otherhand, it can be mecanical, but as far as your axis moves smoothly, I guess it's ok.

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Collective intelligence emerges when a group of people work together effectively. Prusa i3 Folger (A lot of the parts are wrong, boring !)