Ok so in a nutshell they took a turtlebot and stuck a 3d printer on top of it. Crazy what qualifies as an IEEE article these days. Wasn't there a working imple

Ok so in a nutshell they took a turtlebot and stuck a 3d printer on top of it. Crazy what qualifies as an IEEE article these days. Wasn't there a working implementation of cooperative holonomic robots a few years back that each had a print head and they could print arbitrarily large parts by driving around instead of using a gantry for the xy axis? I'm trying to find the article but Google just swarms me with a quadrillion results of how to 3D print a mecanum robot so there's that.