Kritzlerbot Polargraph (printable)

thingiverse

Check out more pictures of this amazing project at http://www.flickr.com/photos/lanthan/sets/72157629185958843/with/6823716121/. It was inspired by the Kritzler (http://tinkerlog.com/2011/09/02/der-kritzler/) and Polargraph (www.polargraph.co.uk) designs, as well as the creator's own itch to innovate. For more inspiration, check out AS220s (http://www.as220.org/labs/drawbot/). The creator liked Polargraph's rotating axial mount but used sliding rings made of PLA instead of bearings for the axes, which fit closely and worked great with some Teflon spray. The machine is yet to be mounted and tested, so stay tuned! Other available sources include Makerblock's build (www.thingiverse.com/thing:16384) and JohnA's gondola (www.thingiverse.com/thing:12557). The machine was commissioned in early February, and the mechanics worked as expected. The firmware is now working perfectly with the controller. If you download the current files, pay close attention to the distance between the servo mounts on the hub, which may lack about 1mm. An improved model is in progress. You'll need to print two stepperbases, two plate1s, one hub, two hubspacers, two hubrings, and one hubcap. You'll also need T5 pulleys (either printed or metallic), a 6m T5 belt, or alternative solutions like a small spool and nylon monofilament or ball chain. The two NEMA17 motors used were overkill but worked well. Each motor was fastened with three M3x35 bolts, and an improved version will have additional washers for height. The hub or gondola's axis hosts consist of one spacer, two rings, one spacer, and one cap fastened with one or two M4 bolts. Near the tip of the pen, set three M4 nuts and bolts to secure the pen. The creator used an on-the-test-board ATMega328 and two stepsticks instead of a boarduino after an unfortunate power mishap. For the firmware, use this modified version with step/dir drivers (http://www.thingiverse.com/thing:17051).