Generate a perfectly fitted, 3D-printable case for your Generic BME280 Breakout Module (GY-BME280). Verified 15x11.5mm base dimensions with Tiny footprint (15x11.
Ambient sensors (temperature, humidity, pressure) REQUIRE direct airflow contact with the outside environment to report accurate readings. Enclosing the sensor in a sealed volume creates a microclimate lagging ambient by minutes and biased by component self-heating (~2°C under I2C polling).
PETG is the indoor default. ASA is preferred for outdoor weather stations — its UV stability exceeds both PLA and PETG for long-term deployments. ABS bridges the two for garage/shed/semi-protected environments. PLA is omitted: outdoor UV is its weakness.
Place sensor away from heat-dissipating components — 10mm from regulators, LEDs, and CPUs minimum. Ambient drift from self-heating is the #1 BME280 field issue.
Vent aperture should use a fine mesh or Gore-Tex patch, not open air — prevents dust/moisture direct ingress while allowing pressure equalization.
Pressure measurements require the enclosure volume to equalize — a sealed pocket will report static pressure, not ambient.
Adafruit variant (25.5x18.2mm) is larger than GY-BME280 generic (15x11.5mm) — verify the specific board before committing to a footprint.
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Mechanical properties are estimates. Validate critical loads before use.