As someone that has one, I’d say more than 80%. That might be accurate if you only print other peoples’ designs, but for functional parts I’ve designed, 80% are a total non-issue, 10% need to be rotated 45 degrees on the build plate, 5% need minor redesign to fit, and the rest I was able to break into multiple prints without issue.

Even if you eventually need a bigger printer, I’d still buy this one. I’ve definitely run into situations where I need to print multiples more often than I’ve wanted to print something big.

I don’t think it has much practicality, just get some known straight/square object and attach your test indicator to the toolhead. Measure your motion error directly.

Open source is a major boon for process automation in a print farm. I also wouldn’t trust ANY cloud platform with anything remotely sensitive, like product development prototypes.

Looks like that arm would be a floppy noodle, it wouldn’t surprise me if it needs re-calibrating halfway through a print just from temperature changes.