As I said, its destroyed. squashed flat by 90lbs of iron barbell weights heh :^)
But its easy enough to make one however.
-6 jumbo drinking straws
-1 11x8.5" sheet card stock paper
-2 waste milk jug caps
-High-quality tape, like Kapton
-(Optionally) school glue, & Scotch-tape
-1 oil funnel, trimmed to ~0.70in inner orifice
-1 dowel, sized to fit fairly snugly through 1 straw
-1 broom handle, ~0.75in dia.
-Very tightly roll, then Kapton tape the paper into a tube around the broom handle (you don't need a full sheet; cutting it in half along the 11" side will leave you with 2x 5.5x8.5" subsheets -- enough for 2 tubes).
-Remove & slide this paper tube onto the (outside tip) end of the funnel, with a solid friction fit. (Optionally, you could temporarily Scotch-tape it there.)
-Putting the dowel through one straw, compress the other five into a ring around this central one (gripping around it all together firmly in one hand, then temporarily securing a piece of Scotch-tape around the end of the straw bundle (away from the funnel) with the other hand worked for me).
-Force this collection together down into the funnel, and then on down into the attached paper tube (it should be a very tight fit; that is, you want all the straws to be under stiff compression together inside the paper tube).
-Withdraw the dowel (alone) back out of the funnel.
-Remove this radial-core strut from the funnel's end, snug all the straw/paper end alignments, and securely fasten the two milk jug endcaps on (if your cap-inner/tube-outer diameter sizes are proper, they should match & twist right on; otherwise adjust sizes accordingly). Glue helps.
-You can even inject standard expanding construction foam down into the straws (once they're inside the paper tube, & before the second endcap goes on; use a very fine injection tip to fit into each straw individually), for extra strength against lateral forces. Please wear eye-protection!
-Generously-coating the innermost straw with school glue first (before compressing the other five down around it) will improve this resistance further, once cured. (Be sure to force them all together down into the paper tube -- as mentioned above -- while the glue is still wet.)
-3D-printing 2 custom solid endcap fittings, to hold 3x of these tubes tightly together into a single assembly (and wrapping it around with tape) would provide for a ~$1.50, ~6oz, short strut that I estimate should hold 300+lbs up quite handily (and be much
more resistant to lateral forces than a single one alone).
That's it Kiwi. Cheap, lightweight, and readily-assembled from simple components; using no electricity to do so (not counting the materials manufacture, ofc). It has a hollow central core which could be used to provide ordered-passage access for actuation cables or wiring. And it's quite strong for linear compressions too! I was thinking of bird bones when I tinkered it all together like this, while casting around for a set of everyman
robowaifu manufacturing approaches; both in cheap materials and simple, easy construction techniques.
Good luck Anon.
One other thing Anon. This lightweight strut's strong game is standing up to compressive
forces. Can you think of any other design approach mentioned recently ITT that utilizes compression
as one of it's two key structural forces? :^)
-prose, fmt edit
Edited last time by Chobitsu on 03/10/2023 (Fri) 08:28:03.