https://www.heisel.one/blog Practical projects, experiments and field notes by Oliver Heisel about data, sailing, 3D printing and building useful things. en Fri, 10 Jul 2026 12:00:00 GMT https://www.heisel.one/post/powerbox-for-sailboats https://www.heisel.one/post/powerbox-for-sailboats Fri, 10 Jul 2026 12:00:00 GMT A compact wall-mounted 12-volt power supply with replaceable Bosch 18-volt batteries, designed for a sailing boat. https://www.heisel.one/post/sunshade-esse850 https://www.heisel.one/post/sunshade-esse850 Fri, 10 Jul 2026 12:00:00 GMT A custom sailboat sunshade made with tent poles, 3D-printed connectors and carabiners, ready in under four minutes. https://www.heisel.one/post/learning-for-the-ubi-vhf-certificate-with-flashcards https://www.heisel.one/post/learning-for-the-ubi-vhf-certificate-with-flashcards Fri, 09 Jan 2026 12:00:00 GMT Official radio certificate question catalogs converted into clean CSV flashcards for efficient learning with Anki. https://www.heisel.one/post/visualizing-swiss-lakes-with-geojson https://www.heisel.one/post/visualizing-swiss-lakes-with-geojson Wed, 19 Nov 2025 12:00:00 GMT Clean GeoJSON shapes of Swiss lakes, ready for web maps, dashboards and lake-specific weather warnings. https://www.heisel.one/post/why-you-should-start-3d-printing https://www.heisel.one/post/why-you-should-start-3d-printing Sun, 08 Dec 2024 12:00:00 GMT Start 3D printing to bring ideas to life. Embrace trial, iteration and growth instead of expecting perfection at the first attempt. https://www.heisel.one/post/unleashing-the-power-of-your-mac-running-local-ai-like-chatgpt https://www.heisel.one/post/unleashing-the-power-of-your-mac-running-local-ai-like-chatgpt Fri, 06 Dec 2024 12:00:00 GMT Run a private, offline AI assistant on an Apple Silicon Mac with MSTY, without command-line setup. https://www.heisel.one/post/spacex-starship-keychain https://www.heisel.one/post/spacex-starship-keychain Fri, 22 Nov 2024 12:00:00 GMT A 3D-printed SpaceX Starship keychain in multiple sizes and variants, modeled and printed in matte black PLA.