Z axis movement

Hi-

I just completed my Prusa... this morning. I got two test prints then had to go to school.

Printing started. Far too much plastic was being extruded. My extrusion was at .1 when i finally had a nice print... But it was about 1/8 as tall as it was supposed to be (ish). So I know my z axis isn't moving enough. How do I fix this.

RAMPS 1.4. Prusa Mendel. .35mm nozzle. 1.75mm filament. Pronterface.

-Nick

looks like you need to adjust the DEFAULT_AXIS_STEPS_PER_UNIT in your firmware...

Im using M8 threaded rods and i have 3200/1.25 as the z axis steps.

To test, simply go to pronterface, get a ruler out, hold it perpendicular to your bed, then measure a reference point on you x carriage to the bed. then command the z axis to move up by 10, then see if your reference point has actually moved 10mm.

When it was supposed to go ten it went 2... How do I adjust it. Im using Marlin.

Thanks,
-Nick

I found this line...

#define DEFAULT_AXIS_STEPS_PER_UNIT {78.7402,78.7402,200*8/3,760*1.1}

What do I change?

-Nick

Nevermind... I changed it to what you said... IT WORKS!!! I am so happy and thank you so much for your help.

-Nick

hi nick, sorry that I forgot to reply your post.

glad that you solved the problem.

also make sure your x and y axes are moving accurately too. you'll need to do the same for your extruder as well. (the last set of value)