/diy/ - Do It Yourself

Part warpage reduces the workpiece-nozzle gap height, which in turn causes more problems.

The upwards force on the nozzle depends on the height and width of the gap into which the filament is extruded. Moretti 2022 measured forces around 0.1 to 1.2N with a load cell. The signal is mostly (0.8N) due to gap width, and they didn't separate the height component. Whereas picrel is not a sensor, it is suggestive of active sonar or nc-AFM.

US8393009B2 seems to use the same piezo electrodes to both create and measure vibration. The usual AFM uses a PLL, but I don't understand how that applies when vibration sensor is also the vibration actuator. Is the drive circuit left out of the patent because it's obvious, or is half of the invention still secret?