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You know, everyone I see uses that tug boat print for their calibration, but what you made here was far more intricate and beneficial.
How did tug boat become the standard test print? Wouldnt car or eifel tower have the same curves/arches/height for all the test things?
The short answer is someone designed it specifically to demonstrate calibration across different printing conditions and it took off in no small part because it's cute and can serve as a filament sample.
This. If you really know the tugboat, you know almost every detail is a test of some sort. Many people don't even know that 2 fit together perfectly(flip one upside down and rotate 180° - the smoke stacks fit into the box behind the cabin and they interlock)
Nobody knows.
JK
I think it's because Benchy has a crazy amount of changing surfaces and is easily printable with or without supports, scales better, and doesn't take terribly long to print.
The answer isn't glamorous, "because someone made it, and it works well."
Also the "3DBenchy_Broschure_3DBenchy.pdf" file it comes with is helpful.