MakerBot Industries

In last week’s Robot Hospital, I was remiss in mentioning the test piece I used to demonstrate that Skeinforge issue.  So I just wanted to give credit where it’s due, and spotlight this useful calibration print by the tireless MiseryBot.

This is a really nice calibration piece, and it should be helpful for many issues other than the one I mentioned.  It can also bring out other skeinforge bugs, as you can see from the main item photo.

And of course, it’s brilliant at demonstrating the “extra shells” bug — print one with 2 extra shells, and you’ll see see that the narrowest X’s and O’s are unfilled — then print one with zero extra shells and it’s hunky dory.  Remember that next time you’re printing an item with very thin walls and they’re coming out hollow!

And don’t forget to check in tomorrow afternoon for this week’s episode of Robot Hospital!

Wall Thickness Calibration Test Piece by MiseryBot

THIS THING IS FAMOUS! Shows up at 1:54 on this episode of Robot Hospital: youtube.com/watch?v=shpt1hD4z7Y This thing can be used to see what your skeinforge settings and bot will do for certain wall thicknesses: 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2 The OpenSCAD is included in case you want to try other thicknesses. The image has the "as designed" thickness in green, the measured straight wall thickness "as printed" in red (for my bot, of course), and the measured cylinder thickness in purple. My bot is set up with 0.25mm layer thickness and W/T of 2.0 for theoretical wall thickness or 0.5mm. For reference, I am using the MakerBot 0.4mm nozzle, but that really does not come into play. Slightly related to: thingiverse.com/thing:7114

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