One of the coolest things to watch is to see a print "self heal",

One of the coolest things to watch is to see a print “self heal”, when something goes wrong and you’re able to fish-out a piece of the first layer that didn’t stick, or got pulled-up by the nozzle and then layer after layer, the gap left goes away, eventually unnoticeable.

It’s just cool :slight_smile:

And one of the most melancholy is the opposite - seeing a tiny bit of ooze or the like build up layer after layer until it’s turned your infill into a blob.

Or the slow warping of ABS and it slowly unsticking from the bed, ohh man that bugs me.