This is my polar printer, it's down for a bed bearing upgrade at the moment, but she's definitely running and the duet's working a treat.
Working volume is 570mm diameter by 1150mm tall.
Here's some footage of her in action...
The YouTube playlist for the build so far is here:
My channel is www.YouTube.com/CNCModellerUK
I'm hoping to come to TCT so will drop by the stall. If you want some better pictures just let me know!