_An open heater block concept for high-flow printing and duct-friendly design. _ This heater block concept was born from a practical frustration: most high-flow hotends either complicate part cooling duct design or rely on proprietary heater cartridges and thermal sensors.

Altura 25 keeps things simple and accessible—compatible with standard V6 nozzles, heater cartridges, and sensors—while still supporting efficient duct geometry. The block stands 25 mm tall (slightly taller than an E3D Volcano) and interfaces with Dragon-style cold ends. Its narrow lower profile preserves space for fan ducts, making it especially useful in compact printer builds.

To keep mounting fasteners accessible without sacrificing duct clearance, the heater cartridge clamp is tilted at 50 degrees, and the sensor screw is angled at 10 degrees. These improve usability but do increase machining complexity. The vertical heater orientation was deliberately avoided to keep the nozzle area unobstructed for better cooling.

This design hasn’t been built or thermally tested yet. It is released as an open hardware concept, with the hope that others with thermal or manufacturing experience will explore and evolve it.

The overall geometry was loosely dimensioned from the E3D V6, while the structural and thermal decoupling concept was inspired by the Slice Engineering Mosquito. Please don't kill me, Slice Engineering. 😅

If this sparks ideas or improvements, I’d genuinely love to see where it goes.