Latest revision of the one-handed bottle opener. Revision 6 or so failed after a few weeks' use, but you can see that the problem wasn't completely solved with my current daily use one (revision 8 or so) because the stress crack is starting in the same spot. In-progress photo of the latest revision (10 - I don't print all of them) shows how I hold the flat neodymium magnet in the slot with another magnet so the magnetic auto-level probe doesn't suck it right back out again. This revision is a couple millimetres thicker through the region that habitually cracks, so we'll see how it stands up.
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- No, not quite: if you have the same amount of material in cross-section, then yes, a box beam, I-beam, hollow tube, etc. are much stronger in torsion and bending than a prismatic member. But that's with the same amount of material in cross-section. If I took the same volume of plastic and created an opener that was four times as big, sure, I could make it stronger. But I'm constrained by the dimensions of the bottle and so on.Oct 18, 2014
- A truss is made to distribute weight...does something similar work when pulling?Oct 18, 2014
- In straight tension, probably not - total cross section is all that matters. But almost nothing in life is that simple. Any real-world application usually involves bending, torsion, etc., and that's where an expanded cross-section really shines. (And trusses would be less strong than a solid laminated wedge of plywood with the same overall dimensions - but the laminated wedge would weigh a ton and might cause your walls to collapse...)Oct 18, 2014
- Could you reinforce the outer side with some sort of metal? I'm thinking maybe a little bit of copper wiringOct 18, 2014
- I'm not sure how I could reinforce it from the outside, but it does occur to me that I could perhaps replace the coin with a washer and run a bolt up through it. Hmmm...Oct 18, 2014
- I guess I should say the outer edge of the opener... with the print material covering it all around.Oct 18, 2014
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