That’s Joris. He’s an amazing guy. Last I checked (6 months ago) he doesn’t work for Ultimaker but he works at the fablab that started ultimaker and he is very friendly with the founders and others there. Joris is the guy who 3d printed the life size elephant (1:1 scale) at schipol airport.
I’m sure it’s powered by the same batteries popular now on quadcopters. The printer should work fine from around 20V to 24V so a 6S lipo pack would be 22.2V which is close enough. I’ve seen people with UMO printers on their backs - that used to be a thing at shows like Makerfaire. I’m not sure if Joris started that also. Those were closer to 19V so a 5S pack was used. There used to be a “Joris” feature in Cura but now it’s called “spiralize” I think.
Those lipo batteries are pretty amazing - they can pack a lot of power in a light weight battery - very popular for fixed wing and multi propeller drones. They also tend to burst into flames if you let them discharge all the way and spew out molten metals so I’m guessing this one was followed with a cameraman the entire time.
Oh also - FDM printers can print in any orientation. I’ve tried it as I thought it might improve overhangs but alas it seems to make no difference. Ultimaker at makerfaire’s and such used to hang a printer upside down by a rope sometimes while it was printing.
Say what you want about other printers doing the print… and how the shipping company treated the package… but overall the concept is pretty cool if you asked me! I mean I once tried 3D printing in my car as I was driving with my UM2 but sadly my power inverter didn’t have the goods =(… so no dice (even with the heated bed off). Being I am a bit of a snob for camera work in videos I have to say they did an A+ job documenting it given the circumstances!
And lets face it Europeans tend to be pretty mellow people from my experience vs Americans so it could explain why they didn’t play football with the box :-D!