DrawBot – Giant Unicorn?

As you may know, I’ve got a MakerBot Cupcake named “Bender” and a MakerBot Thing-O-Matic named “Flexo“.  There’s really no doubt in my mind I’ll be springing for a Replicator with dual extrusion1  Thankfully, I think there’s a way for me to make use of each of my robots, in its own special way.  I figure I can keep the Cupcake rocking a Unicorn Pen Plotter, use my Automated Build Platform in my Thing-O-Matic for mass production of smaller parts, and put a Replicator to work printing new, wacky, and/or large designs.

But, why am I talking about giant unicorns?!  Sandy Noble, the creator of the Polargraph,2 just posted about how he has created a vector graphics importer for the Polargraph software.  This is some pretty amazing stuff.  The MakerBot Unicorn has several software toolpaths that take vector graphics to GCode for printing through ReplicatorG.  The end result is that a Polargraph rocking a vector graphic importer should be able to draw arbitrary shapes, without the need to draw scribbly bits.

I think it would be particularly awesome to have a DrawBot draw a frame/border and then fill it with a scribbly/pixelated drawing.  Or, perhaps, draw the outline of an object and then fill it in with scribbly/pixelated shadings.

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  1. Will my extravagance know no bounds?! []
  2. Which is probably the best documented DrawBot on the internet []

DrawBot – The Hacks

Sandy Noble's modifications to Adafruit's Motor Shield
Sandy Noble's modifications to Adafruit's Motor Shield

Chatting with Sandy Noble over at the Polargraph website has been extremely helpful1  It looks like he’s added three changes to the Adafruit Motor Shield:

  • Heatsink added23
  • Breakout boards to connect the terminals to the clips for the motor leads.  However, it looks like there’s a small little component of a circular purple variety also on that board.
  • Extra pins for hooking up a cooling fan.  Sandy says he doesn’t use them any more, but it really wouldn’t be a bad idea given that it would take hours for even a simple print.
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  1. The photo is from Sandy Noble’s photo stream.  It says All Rights Reserved and I will happily take it down if he asks and says this is not a fair use.  Given that all of his stuff has been very open source, I’m guessing this was just a default setting. []
  2. To the H-Bridges? []
  3. Also…  Where does one get a heatsink?  How do you attach it? []

DrawBot – The Plan!

What’s next?

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  1. Printing, for sure! []
  2. I don’t fish, but I have a bunch left over from a prior project []
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