Ideas for improving my DrawBot

Polargraph drawing by Sandy Noble

Polargraph drawing by Sandy Noble

I’ve given a lot of thought to how I can improve my DrawBot setup now that I have a Polargraph brain on the way1

  • Print a nice 3D printed plastic case for my DrawBot brain
    • The 3D printed plastic case I have for my current DrawBot doesn’t fit very well2 and doesn’t look awesome as it is literally duct taped to the plywood. An awesome new brain upgrade deserves a sweet new plastic case. I might customize Sandy’s design by adding some dual-extruded black/white hotness to it.
  • Putty, sand, prime, and paint my big chunk of plywood so it is presentable
    • Though, really, since I would just paint the wood white anyhow, I’ll most likely just prime the wood twice and call it a day.
  • Reconsider beaded cord versus fishing line
    • I’ve been using fishing line for my DrawBot, but many others including Sandy use beaded cord.
    • Fishing line. Fishing line is great when you enjoy the process of drawing as much as the drawing itself. From more than a foot or two away the pen holder looks like it is just floating in space. It is also cheap and pretty easy to manage with just a spool attached to the stepper motor. The biggest downside is that since it is wound around a spool a full turn of the spool when it is full of fishing line will let out more line than when there is little fishing line left on the spool. Every time fishing line is pulled in, it adds very slightly to the diameter of the spool and will skew the drawing. There are a few ways to compensate for this. You could enter the diameter of just the spool, spool full of fishing line, or spool half-full of fishing line. Each different usage will basically skew the drawing slightly differently. Another, more complex, alternative is to try to compensate for the extra diameter caused by the fishing line by fiddling with the code itself to consider a different spool diameter depending upon how much fishing line has been reeled in or out. Since this is way beyond my current Arduino programming capabilities, I’m just leaving it here as food for thought.
    • Beaded cord. Beaded cord is also fairly cheap, and certainly way cheaper than using a toothed belt. Since a beaded cord with matching sprocket does not accumulate on the sprocket, you have to figure out some way to manage the beaded cord – even if it just to let it hang off the side of the robot. With a kid and a cat, long loose lengths of cord might be problematic. Now that my daughter is older, this is less of a consideration. Lastly, the beaded cord will allow you to consistently draw images without having to worry about the spool-fishing line-variable diameter problem.
    • As I’ve been thinking about exhibit a drawing robot at the upcoming Bay Area Maker Faire in May
  • Design, print, and attach a mount for a large roll of paper
    • Ideally, when I’m done with a print job I can pull the paper across the print surface, tear off the finished drawing, and have a fresh new piece of paper ready to go without having to spend a lot of time re-aligning and re-mounting paper.
    • While it would be super cool to have the roll of paper motorized, I have no delusions that I’m going to do this.
  • Design, print, and use a new gondola, complete with servo powered pen-lift
    • Although I have the servo ready to connect to my existing DrawBot, I never did this. My favorite looking drawing robot drawing techniques were all TSP single line art or single-line-shading, so there was never a need for a pen lift or servo. I basically never invested the time to improve my gondola to do much more than create reliable drawings. As it is the gondola is weighed down by a piece of wire poked through a ziplock baggie with half a dozen old batteries inside. I like this solution because it is essentially re-using old batteries as small modular weights of consistent mass. But, there are so many better ways to use old batteries as weights without it being ugly. Plus, with a servo enabled gondola, I’ll be able to explore the world of vector drawings. I should probably just create a Polargraph style gondola and call it a day, since Sandy has logged more hours with a drawing robot than anyone else I’ve heard of.
  • Route wires in a pleasing manner
    • As you might have figured out by now, my current DrawBot set up is hacky and ugly. I’d like to have my DrawBot set up so that it looks nice and not a tangle of wires leaning against the wall.
Posts in the DrawBot Adventure Series
  1. Wanna make a DrawBot?
  2. DrawBot Resources and Links
  3. DrawBots for the slow learner
  4. DrawBot - Parts Ordered!!!
  5. DrawBot - The Breakdown
  6. DrawBot - Parts Shipped!!!
  7. DrawBot - What would you draw?
  8. DrawBot - The Plan!
  9. DrawBot - The Hacks
  10. DrawBot - The Delivery?
  11. DrawBot - The Delivery, Part II
  12. DrawBot – The Delivery, Part III
  13. DrawBot – The Assembly, Part I
  14. DrawBot – The Software, Part I (and an existential conversation)
  15. DrawBot – The Delivery, Part IV
  16. DrawBot – The Assembly, Part II
  17. DrawBot – The Assembly, Part III
  18. DrawBot – The Assembly, Part IV
  19. DrawBot – Design Considerations
  20. DrawBot – Halp!!! No - seriously, a little help?
  21. DrawBot – The Face Palm
  22. DrawBot – The Delivery, Part V
  23. DrawBot – The Silver Lining of Failure
  24. DrawBot – The Delivery, Part VI
  25. DrawBot – The Assembly, Part V
  26. DrawBot – The Assembly, Part VI
  27. DrawBot – Printed Parts
  28. DrawBot – The Assembly, Part VII
  29. DrawBot – The Operation, Part I
  30. DrawBot – The Breakdown, Part II
  31. DrawBot – Printing!
  32. DrawBot – Printing, Part II
  33. DrawBot – Why are you crying?
  34. DrawBot – Calibration
  35. DrawBot – Pen Selection
  36. DrawBot – How to Recover from a Stalled Print!
  37. DrawBot – Drawing Success(ish)!!!
  38. DrawBot – Pen Selection, Part II
  39. DrawBot – Onwards and Upwards!
  40. DrawBot – Another Successful(ish) Drawing!, and an Update
  41. Restarting a Stalled DrawBot Drawing
  42. TSP FTW!
  43. Speedier DrawBot Drawings
  44. Excellent DrawBot Slides
  45. Another Drawing Robot!!!
  46. The biggest inkjet printer ever
  47. Why do DrawBots draw on walls?
  48. Maze Code + Polargraph?
  49. All New Polargraph on the way!!!
  50. Ideas for improving my DrawBot
  51. DrawBot Aesthetic Re-Design Ideas
  52. The Eagle Has Landed
  53. This project is not going to overengineer itself
  54. Overengineered Spools
  55. Overengineered Stepper Motor Mounts, Filament Guides
  56. Overengineered Bolt Endcaps, Case Holder
  57. Sourcing DrawBot Parts
  58. DrawBot - A Tour!
  59. Arduino Powered Drawing Robot Poll
  60. Building an Arduino Drawing Robot - On The Cheap
  61. DrawBot - Printed Parts Tour
  62. Unidentified Foam Object
  63. Arduino Powered Drawing Robot - Take 2 (Or 3)
  64. DrawBot, now ACTUALLY wall mounted!
  65. A Study of Drawing Robot Pen Holders and Design Considerations
  66. Drawing Robot Pen Holders, Calligraphy Pens, and Thought Experiments
  67. Ideal Qualities in a Drawing Robot Pen Holder
  68. Enough talk! Finally a pen holder!
  69. DrawBot Pen Holder Post Mortem
  70. To Maker Faire!!!
  71. Skipping! How could I forget the skipping?!
  72. Drawing Robot Penmanship
  73. PlotterBot at Maker Faire Bay Area 2013!
  74. PlotterBot.com - a new site dedicated to drawing robots
  1. Photo courtesy of Sandy Noble []
  2. I can only blame the designer – me []

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