A video on TPU printing... he's using the same printer as mine, so I'm hoping I can do it too, though he seems much better at the finicky stuff than I am. I get impatient. 3d printing is like the Potions class at Hogwarts.
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First time trying to print a design with difficult overhangs: yak horns for use with yak rover
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made a 3d model of yak horns that can be 3d printed and bolted on to any of our robots... forms in onshape) #yakbot
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Auto support generated by Cura looks dubious but ok
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Nope. Support adhesion failed near end of print. I think I need a raft for this. And/or design in my own supports. The two pillars at horn tips got ripped up. Wonder why? Up-tension from horn curve?
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On the plus side got to try my dremel for clean-up cutting off of supports and sanding.
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Not the best job but am starting to get the hand of using a dremel. The high-rpm/low-pressure way is much more fun than a drill.
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Recently remembered one of my earliest introductions to engineering thinking: my dad (a mechanical engineer) posing a classic CAD brainteaser to me when I was a teenager: what object looks like a circle in the top view, a triangle in the front view, and a square in the side view?
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Later in freshman engineering school, our engineering drawing instructor posed the same brainteaser, before proceeding to demonstrate the answer by shaping a piece of chalk into the answer (whittling a piece of chalk by rubbing it on a board is legit machining btw)
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The answer, which I just made in OnShape using the loft feature, is a thing which may have a name, I don't know, but is kinda like an oddly shaped cone frustum. Here is the drawing:
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I was a little surprised by how unfulfilling I find this. The answer is “this weird shape I made up.” Feels like cheating, like this alternative solution to the sphinx’s riddle. (I miiiight not be an engineer. 😂)
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There’s geometric subtleties hiding in the answer though, fun for math/geometry people
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