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# Cartesian Dimensional Calibration with Instructions and Excel-Calculator

Jun 17, 2017

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You don't need that for a cartesian machine except for the extruder ! In fact you will likely introduce errors !
Just simple arithmetic to determine the step/mm for X,Y,Z. Belt, lead screw pitch are known values and pretty accurate, more than the measures you will take.

waldamore - in reply to MKSA

in theory you are right. my calculated values did some ...well...okay results.
but the fine-tuning was the interesting and important part!

i did the math and my first calibration cube was a little off.
so i run the adjustment a few times and came up with these values (yours will vary) :

X-Axis: 80 --> 80,297
Y-Axis: 80 --> 80,055

doesn't look like much, but makes the difference between 98,63mm and 100,01mm.
and - at least in mechanical parts - that is a LOT.

MKSA - in reply to waldamore

No the way you do it is wrong.
The differences are due to extrusion width, slicer, axis not square to each others etc... You compensate for these by changing the step/mm but that is only OK for a 100mm part. on a bigger or smaller part, it will be different.

waldamore - in reply to MKSA

since my latest calibration, i did some prints and they turned out VERY accurate:

expected --> measured
66,00mm --> 66,09mm (x-axis)
95,00mm --> 94,96mm (y-axis)
20,00mm --> 20,00mm (y-axis)
20,14mm--> 20,12mm (x-axis)

besides you listed some features i haven't looked close enough yet.
so maybe i can improve my print quality even further! :-)
that's how learning works, right?
next week i'll try cura instead of S3D.
can you please provide me some tipps / liks / thingis, i can learn from?

MKSA - in reply to waldamore

Are you serious ? You measure 3D printed plastic parts to 1/100th ? Do some reading about metrology, visit the metrology dept in a factory. Then we can talk.
Bye