calibration issue

[mrszozd 0]

hello,

I'm looking for some idea how to calibrate the printer to get directly the same dimensions like in the model. After several prints i recieved 6,93-6,94 [cm] and 7,05 [cm] from square designed at 7x7[cm]

have You got idea how to calibrate this?

I know that there are some calibration models and procedures available but the only problem that I see is that those models are tubes, spirals which are hard for precise measuring...

 

[calinb 11]

I assume you are using volumetric mode in netfabb. The problem with every slicer I've ever used is no single calibration object covers everything you are going to print. Without going into the possible reasons behind my observation, I can only recommend that you scale each model when you find unacceptable dimensional errors. Unfortunately, even this customization often results in imperfect dimensions because not all of the dimensional errors found in a print are equal--percentage wise. If the errors are not in proportion, you can't apply a global fudge factor for each of the axis to correct all errors. You must compromise.

I have an Ulticontroller so I perfer to temporarily change the X-steps and Y-steps (I've not found Z-steps to ever require changing). Be aware that I've also found larger dimensional errors with nf when a part is printed on the diagonal of the bed instead of square--more so than when using Cura or Kisslicer, for example. nf appears to be somewhat "Pythagorean challenged!" :(