Calculating force on ballscrew

Hello Community,

I am currently designing a rigid 3d Printer, where the printbed will move up and down. Now I found that one can find newtonmeter forces for nema 17 motors.

Unfortunately I did not study physics so I do not know how to translate rotating newtonmeters to a supported weight on the axis. Additionally, if I have two drive units for the z axis, I suppose that will double the supported weight right?

This data is given:

12mm rod with 4mm forward per resolution
nema 17 with 0.3 nm torgue (more or less fictional for now)

I compiled the below drawing:

Maybe this will help:

[daycounter.com]

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Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]

I already found the page you linked but apparently this is only a force to torgue calculator, not vice versa.

However I still tried the calculation with a fictional force of 6000g on the axis which should be plenty. The result was a minimum required torgue of 0.0565 N*m which looks somewhat unrealistic to me. That would actually mean that I could go around 72'000 grams on the axis with two regular nema 17 Motors...