by bagelturf, published
The more vertical bars, the stiffer the spring. The more horizontal rings, the greater the extent of movement. It's resistant to twisting, but would do very badly in tension I think.
Also note that the spring part need not be on the outside of the concentric cylinders: it could be embedded between them, so protected from damage.
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Any idea how strong this would be with just the outer bars -- or possibly with two layers of bars? I'm thinking it would be a good spring for some landing gear on a quadcopter. Above the spring would be an attachment point. Below the spring would be a landing foot. I'd want the spring to lightly flex but not break in any direction as an landing coming in at a spin could put any direction of force on the spring.
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The three shells are needed because the extruded plastic has to bridge the verticals to make the springy parts and it is this material that makes it into a spring. The 0.2 layer thickness ensures that the horizontal rings in the model align with the slicing and they get printed. PLA is probably too stiff to make this a useful object.
The Blender model uses booleans to add the verticals and the horizontals to the basic cylinder objects, so be sure to look on the other layers for those.
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