3&Dbot is an autonomous 3D printing bot: http://bit.ly/1wDWQUy
#Atmel #3DPrinting #3DPrintingRobot arduino #Makers
21st century version of the Turtlebot 
Of course the complex drive mechanism isn’t necessary for simple Cartesian motion but still its clever.
I think at that size of nozzle, they have a real problem with wheel design causing an accuracy problem. A design with 2 individually powered wheels and a spinning cart wheel or with simply a larger nozzle would be better. Of course, there will always be a height limit to the print.
Each wheel axis should be on a lift with rollers on each corner so that the opposite axis is lifted on X,Y change.
Technically there is no limit to the height, because it can create it’s own platform to raise itself up on. Couple that with each wheel axis on a lifting mechanism and the ability to climb up each created platform step exists.
A swarm of them working together could be very productive.
@Andrew_Hodel I do believe those a a non-angled variant of the mecanum wheel. Those would be rollers allowing it to roll sideways. If this bot did use mecanum wheels, it might not have the resolution problems that I suspect it has.
Those are Omni-wheels. Similar to a Mecanum, but work well with a 3 wheel setup, where-as with mecanums I think you need 4 wheels.
Mira @Patrick_Becker
Mecanum wheels work just fine in sets of three. It’s easiest to lay out if all have the same helix directionand angle.
Thanks for the update, Mark. I broke my first rule of the internet, don’t comment on something unless you know it well
One good way of learning new things…
excellent motion performance and thanks for sharing with us