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   James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:35 JST James Brown

   If my calculations are correct, when this baby hits 300rpm you're going to see some serious shit.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:25 JST James Brown

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     Well I got a lens out of it in the end. It does make it more directional, but there’s more light off axis than I need.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:25 JST James Brown

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     I went back to the slats, and finally got all the bits hooked up together.

     It sort of works?

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:26 JST James Brown

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     How can I be out of silicone?

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:26 JST James Brown

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     Following a series of poor decisions, I now have both a mould and a vacuum chamber coated in uncured silicone.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:27 JST James Brown

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     I did have another swing at it. The first one I’d hoped to slip intact around a stiffer carrier. This one I made wider, and corrugated, so it printed better.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:27 JST James Brown

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     I’ll chop the front off that, and stick it into this to make the mould.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:29 JST James Brown

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     Bah.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:29 JST James Brown

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     I think I can live with it. I printed it vase mode for speed, so I was expecting it to need a stiffer structure to hold it flat.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:30 JST James Brown

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     The slat based collimators are such a pain, I've decided to go for it and try making lenses instead. I think a 3D printed mould will be good enough - the layer height is very much smaller than the LED size, and a bit of scattering is actually desirable. I'm printing this vertically so the lens profile gets the high resolution. It's going to be precarious when it reaches the top.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:30 JST James Brown

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     I had to turn the print 90 degrees - it wiggles rapidly doing the lens profiles, and when that was on the bed slinging axis it shook the whole room. It's a lot less dramatic when it's just moving the head.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:32 JST James Brown

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     It’s very unbalanced with only one collimator attached, so I’m spinning it too slowly for persistence of vision. But I’m sort of able to convince myself I’m seeing depth. There’s a lot of mechanical stuff I need to do before I can start cranking it up.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:32 JST James Brown

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     I have a habit of building displays that are just a confusing flickery mess on video.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:33 JST James Brown

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     The black filament is surprisingly shiny. My first attempt turned out to be a light pipe, and didn't restrict the view. In this version, the slats have a zigzag profile.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:34 JST James Brown

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     It's already slightly terrifying.

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     James Brown (ancientjames@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:34 JST James Brown

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     This is the current approach for reducing the horizontal field of view of the screens - a big heavy box o' slats. I'd like to make a lenticular array, but that's a whole side quest.

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     tobozo (tobozo@mastodon.social)'s status on Sunday, 29-Oct-2023 17:36:37 JST tobozo

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     @ancientjames

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