Inside/ internal measurement adapter - Innenmaßadapter
thingiverse
This versatile adapter easily attaches to any 2-meter folding ruler. It enables precise internal measurements by adapting to fit inside objects of various sizes. Simply place the adapter on the ruler and slide it upwards until it snugly fits within the object's interior dimension. Secure the adapter using the built-in tightening mechanism, carefully remove it from the measured item, unfold the ruler, and take your reading. My initial parts were printed in PETG.
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