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i printed out a publicly available model of the Ultrasonic sensor (HC-SR04). i found that many of the measurements on this 3d model were not correct and off by 1-4mm in many areas. i adjusted the model so it reflected the correct size and then moved on.
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i then repeatedly tested the model over and over with the Ultrasonic sensor and found errors where i didn't account for small chips on the sensor's board. Or when the width of parts like the edges of the circles were too small leading to rapid breakage.
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