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Thank you for the great idea! Will do that mod too.

I'm curious in servomotors too. Any update on this subject?

Thank you so much for your reply Chris. Yes, 5v servo can be used for the focus control, it has enough of torque. I also was wondering to use one of the blue relay switches (that available in your system), which could simultaneously activate the work of another Arduino board and script, so I could be able to run the second arm or the focus motors. But would be nice to control focus in one controlling system.

Thank you! Yup, I'm printing AR3 folder, everything looks clean so far.

Yup, I came up with a same PRUSA 3D printer kit. Today, just started printing parts, it seems it will take me few weeks to print everything, but I waited longer and it's not a problem.