Engineering notebook / project archive

Johannes Prettenthaler

Highschool student and Maker

I am a hardware enthusiast and aspiring engineer based in Graz, Austria. My passion lies at the intersection of electrical engineering, CAD, and practical problem-solving. I love bringing ideas into the physical world. Having already expanded my theoretical foundation through university-level physics coursework, I am currently building my skills as I prepare to pursue a degree in engineering. Welcome to my project documentation.

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Published records
5
Engineering areas
6
Latest entry
2026

Project register

Selected projects

  • Installed 3D-printed optical filament sensor assembly on an Ender 3 V2, with the filament spool and guide hardware visible.

    Project2026

    Optical Filament Sensor

    A custom, non-contact optical filament runout sensor for an Ender 3 V2 that pauses prints and sends Discord alerts.

    Mechanical Design · Electronics · Software

    • Honeywell HOA0865-L51
    • Klipper
    • Discord Webhook API
  • Completed audio switcher HAT mounted on a Raspberry Pi 3B, showing the perfboard assembly, relay, audio connectors and GPIO connection.

    Project2026

    Audio Switcher HAT

    A compact, perfboard-based Raspberry Pi HAT that automatically switches stereo audio sources using a GPIO-controlled relay when an AirPlay 2 client connects.

    Electronics · Embedded Systems · Automation & Control · Software · Fabrication

    • Raspberry Pi 3B
    • Shairport Sync
    • AirPlay 2
  • Overview of the 3D printed fume extractor mounted on a black articulated microphone arm attached to a wooden shelf

    Project2026

    Solder Fume Extractor

    A custom 3D-printed solder fume extractor powered by a 12V fan, mounted on a modified microphone arm with adjusted spring tension.

    Mechanical Design · Electronics · Fabrication

    • Autodesk Fusion 360
    • 3D Printing
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Areas of work

Engineering areas

Browse the archive by the broad disciplines represented in published work.

Small builds

Recent quick builds

Compact experiments and practical workshop improvements.

  • Picture of the Lamp attached to the boom arm

    Quick Build2026

    DIY Soldering Lamp

    A budget-friendly adjustable desk lamp built from a used Tonor microphone arm and an IKEA Mörker lamp using a custom Fusion 360 adapter.

    Mechanical Design

    • Autodesk Fusion 360