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At 1.4 Nm torque, the main motors would likely struggle manipulating a 0.5 kg item, they aren't strong enough to hold a monitor.

Sacrifice speed and add a gearbox?

On the topic of automatically stirring pasta, I saw this the other day!

That is interesting and Amazon has a great algo for matching it to laboratory equipment consisting of hot plates and magnetic stirrers.

I doubt this is strong enough to carry a screen

Multi monitor robot arm stands would do some cool things. An automated rotating sequence when you boot up would feel like a scifi movie.

Pasta is one of the few things you’re not supposed to stir while cooking?

I think you should stir it occasionally. It might depend on the pasta, though.