I have a couple of random questions.

I have no idea about the robo arm.

As for thr round walls, in the walls section of build mode, there are rooms with round walls. They come in three different sizes ( if I'm not mistaken). Chose the size you want and place it down. The foundations and/or platforms glitch with round walls, as far as I know it hasn't been fixed.

I've heard that the Robo arm will lessen the amount of shocks you get while working at the station. Been a while since I tried it out, so can't say for sure. Don't think there was much else to it.

Edit: According to a guide, it also increases the Robotic skill gains, as well as crafting speed.

Can the robo arm be gifted to other household members, or is it restricted to the one crafting it?

I would suppose it could be a gift as the sim will have it in their inventory. One way you can tell for sure, click give gift and check on the list that comes up with stuff in their inventory. I've had my sim give gift and found out that even though it's in the inventory, it isn't available to give. Really irritated the stuffing out of me.

The arm both speeds up robotics crafting and reduces the chance of shock.
And looks cool.
:)

Thank you so much for this info! Yes, it does look cool. :D

Thanks for the response. Yeah, I know all about walls glitching out the foundations, lol.

Thanks for the tip!