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How much will these motors carry?

Hi guys, this is my first post here.

I am designing a 3D printer and need to know how much weight these motors will support:

Motor specs:

- holding torque of 4.3 kg*cm

- rated torque of 4.3 kg*cm

- Max rpm of 2344RPM

Set up:

I will have two motors lifting a platform vertically. Each motor will have a belt tying it to two of four screws (one at each corner). The ratio is 1:1 from the motor to the screw and the screw has a lead of 5mm. I'd like to aim for a speed of 150mm/second at a fair acceleration (what ever that may be).

I'm really not sure what the calculations are to determine what this set up will support as far as weight for a platform (ignore friction). In the image, I am looking to see what weight i need to aim for for the motors to move the yellow parts up and down at the specified speeds. Solidworks is giving a mass of roughly 10kg.

Thanks for your help