Reprap micron is doing something similar https://github.com/VikOlliver/RepRapMicron
This guy is a legend. His whole series on building this along with other videos is worth watching on YouTube. It amazes me how some random guy simply drops a sub um manipulator diy on YouTube and disappears into the ether. No promotions nothing.
I was surprised to see this here and was wondering if he updated anything from a year ago when I first watched it. Doesn't seem like it but I haven't dug into it. Really nice stuff and I'm hoping he got a job from it or got really busy doing stuff around it that pays the bills.
edit: direct link to the video: https://www.youtube.com/watch?v=MgQbPdiuUTw
Curious how temperature and so forth are managed --- that was a notable effect back in the days when folks were doing things such as engraving The Lord's Prayer on a piece of metal type.
I'm not an expert but the video is very comprehensive. There is closed loop control that is extremely precise in a relative way. In this domain it's all relative anyway because there's no GPS so to speak. It's all reference frames and 3-2-1 locality. [edit: ahhh at 21:47 in the video he says (paraphrasing) "there is offset due to thermal drift of the plastic parts as they get warmed by the motors". ]
Interesting. I researched what you referenced. This is a fantastic "hobby project" level of engineering but if one is truly tasked with this level of metrology there are still many aspects that need to be addressed and corrected for. Usually that means there is a lot of money on the line and one can't mess it up. Hence the high price tag of established industry accepted solutions. -whew- I wrote that myself.
I wonder how it compares to a deltabot, since those are often used for pick-and-place which requires pretty fine resolution. Seems like a delta would have way more range of motion than this.
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Someone posted that today: https://news.ycombinator.com/item?id=50141076
That was me, I realised after I commented that I should make a post about it.