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Success! Modified design to be to have a clampable top. Now to make similar fixtures for other lenses, mirrors, light source, screen… I have a cunning plan to bend the light path with right prisms.
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Bought a pair of right prisms and verified the principle of total internal reflection for myself. Now I can use binoculars and trust they’re not a conspiracy. Do your own research.
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Made a dovetail joint lamp fixture. Will need a box and collimating lens around it, but trying to get basics right. Bulb sits a bit loose 😕
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Used this 5mm copper tape for the connection. This sucks. Connection doesn’t work well. Contact is too light.
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Still, it’s a start. Might reprint with tighter fit. Maybe blob of solder? Will solder stick to PLA?
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Discovered not 1 but 2 embarrassing mistakes. The first fixture was effectively a short since I didn’t notice that the cylinder terminal of the bulb had a ring at the bottom contacting the copper for the bottom nub terminal. Fixed with a bit of insulated tape, and now works fine.
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Second mistake: assumed the bulb has a nearly spherical beam. It doesn’t. It’s like a 30 degree cone, and pointed the wrong way by 90 degrees relative to the light path,
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