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Prusa MINI / MINI+ Integrated Filament Sensor
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Upgrade your Prusa MINI or MINI+ with a clean, fully integrated filament sensor
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Updated at source:
Model information
- Source
- Printables
- Category
- Prusa Parts & Upgrades
- License
- GNU General Public License v2.0
Model update: 30.1.2025
Description update: 10.11.2025
Assembly Notes — Steps That Differ from the Original Procedure
- Cut the PTFE tube to 27 mm, keeping the original chamfered outer edge.
- On the freshly cut side, create a small inner chamfer using a razor blade or any sharp tool.
- Insert the PTFE tube so that the inner-chamfered side faces the steel-ball opening.
- Before tightening the motor screws, gently push the motor axle (drive wheel) away from the driven wheel axle to reduce friction. This prevents unnecessary noise during operation.
- Don’t forget to insert the steel ball.
- Screw in the lever so that it moves freely, then insert the magnets so they repel each other.
- Mount the sensor and route the cables through the opening to the outside.
- Install the cover.
- Align the cabling neatly.
- Insert the long PTFE tube, ensuring the chamfered outer edge faces inward.
- Enjoy your upgraded sensor assembly!