PrintBot Prints On The Ground, Uses Talcum Powder

Yes, this is a printing ‘bot but it’s not a 3D Printer. Even though it’s called Printbot, don’t get it confused with other products that may begin with ‘Print’ and end in ‘bot’. Printbot is half Roomba, half old inkjet print carriage drive and the remaining half is a small PC running Windows CE.

The whole point of this ‘bot is to draw/write/print things on the floor. No, not in ink, in talcum powder! The Roomba drives in one axis as the powder is systematically dropped in the ‘bots wake. It works one line at a time, similar to how a progressive scan TV displays an image on the screen. The PC on board the Printbot reads 8-bit gray scale images from a USB drive, re-samples the image and outputs the image one line at a time to an external microcontroller. The microcontroller is responsible for driving the Roomba forward as well as moving the hopper’s position and dispensing the powder in the correct place. Check out the small photo below. That black and white strip is not there for good looks. It is part of the encoder positioning system that is responsible for communicating the location of the hopper back to the microcontroller.

Printbot HopperTo dispense the talcum powder there is a funnel that acts as a hopper. Down the center of the funnel is a drill bit that prevents any powder from falling out. A small DC motor rotates the drill bit for a specific amount of time and just the right amount of powder comes out of the funnel spout. The funnel is then moved to the next spot that requires a powdery deposit and the process repeats itself.

Now if only someone could come up with a robot vacuum to follow the Printbot and clean up all that mess!

Do you think this is cool but don’t dig the talcum powder? Check out this similar setup from back in the day which uses a marker to write in a dot matrix style.

 

27 thoughts on “PrintBot Prints On The Ground, Uses Talcum Powder

        1. Aren’t you a ray of sunshine.
          This shows technical skill beyond making an LED blink, or copy-pasting Arduino Code. Why don’t you link us something you have done that isn’t ‘rather stupid’.
          Kudos to the project even if it was from 2007.

      1. Wow kudos to kevin.
        @thoriumbr, no the youtube vid is from 2007 as well. Rich Bremer is just really late to (re)write about this. Will O’Brian just left out the video (article came out 5 days after the video was posted). Yay for content filler!

  1. Hi Guys!

    What configuration/setup would you recommend for a printer bot that leaves more permanent prints?

    => forced-air plasma arc?
    => oxy-fuel jet (thermic lance; maybe using iron-dust injection)?
    => thermite?
    => hydrofluoric acid print head?

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