Your best “happy accident” in 3D printing!?

[Alan]

What was your most memorable print fail that actually taught you something useful? Everyone has that one mess of spaghetti filament or warped creature that looked hilarious before it went in the bin. Curious which mistake ended up being the one that taught you the most about your printer or settings.

 

[SpiritTracks]

I had a Benchy warp so hard it looked like it was trying to sail away. Turned out my bed temp sensor was reading wrong by a few degrees. Fixing that made all my first layers way more consistent. So yeah, a failed boat is what finally made me buy a cheap infrared thermometer.