Ask HN: Most interesting tech you built for just yourself?

A custom, DIY smart monocle from off-the-shelf parts, 3d printing, and custom electronics: 1080p60hz, 8-11hrs of battery life on a belt-clip battery + computer combo, has wifi & lte/cellular, can run ML models on device. One third the weight of upcoming Apple AR/VR glasses and one-sixth the cost. Just having it working has increased my efficiency a ton without obstructing vision or requiring me to look at secondary monitors or phone.

Working on replacing my wireless keyboard and trackpad with some "gloves" so I can use it while on hikes or just generally outside. Then, gonna integrate some custom AR and ML/GPT.

Care to share more details on how you're achieving that?

Which part? The glass is an Epson BT-40 cut in half with some soldering to bypass needing both eyepieces; this cuts the weight & power consumption by ~40%. Mounted onto a printed carbon-fiber nylon frame similar to bone conduction headphones. The computer is a single-board computer I had lying around, but I will upgrade to 12-core 30W SBC next week. The battery is one made for video cameras, and I gave it a belt clip and strapped the SBC onto it. The SBC has camera & mic inputs as well as GPIO for whatever I want to add.