First aid bed flatness tester
thingiverse
This handy depth measuring tool enables you to inspect your heatbed or glass flatness with ease, even if you don't have access to a caliper or dial indicator on hand. The magnet version comes equipped with a convenient magnet holder designed specifically for a 6x6x2.5 mm magnet; however, you can opt for the version without the magnet holder and attach any size of magnet using glue.
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