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#1 2021-09-23 14:54:49

Ce1ticWarri0r
Member
Registered: 2021-09-02
Posts: 13

20mm calibration cube printing at 25mm in Z axis

Hi everyone,

I have a new build and I am trying to calibrate the Z steps. I understand the 3 parameters are

Step angle (I think correct at 1.8, its from a phrozen shuffle 2018)
lead screw pitch (correct at 4mm I believe using calipers)
microstep (I have no idea how to know what value is correct)

At the moment a 20mm cube comes out at 25mm

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#2 2021-09-23 18:08:10

Ce1ticWarri0r
Member
Registered: 2021-09-02
Posts: 13

Re: 20mm calibration cube printing at 25mm in Z axis

Is EEPROM enabled. Ie could my nanodlp settings be ignored if an m92 command has previously set the stepa per mm?

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#3 2021-09-24 09:51:49

Ce1ticWarri0r
Member
Registered: 2021-09-02
Posts: 13

Re: 20mm calibration cube printing at 25mm in Z axis

@Shahin, please could we have some clarification around how nanodlp handles steps per mm on the Z axis?

Does nanoDLP use the leadscrew pitch, step angle and microstep settings to define steps per mm and write them to the firmware?
Do we have to define the steps per mm using the M92 gcode in the startup and start gcode settings and if so whats the point of the leadscrew pitch, step angle and microstep settings?
or do we have to define steps per mm in the firmware and flash the nanodlp board? I only ask this because if I type m92 zxxx into the terminal I get an unrecognised code error.

Thanks! The documentation is really light on this issue and I am really struggling to work out the right way to configure my printer.

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#4 2021-09-27 08:04:54

Shahin
Administrator
Registered: 2016-02-17
Posts: 3,541

Re: 20mm calibration cube printing at 25mm in Z axis

No, Only M92 is important all other parameters targeting direct control and for the controller board, they only help nanodlp shows correct values but should not have impact on print size at all.
https://marlinfw.org/docs/gcode/M092.html

Maybe you are using grbl firmware, you should check firmware documentation.

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#5 2021-09-28 09:07:50

Ce1ticWarri0r
Member
Registered: 2021-09-02
Posts: 13

Re: 20mm calibration cube printing at 25mm in Z axis

@Shahin Thank you! That answers so many questions.

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