I've been printing a forest of Christmas trees: https://www.thingiverse.com/thing:1913982, scaled to 33% to fit in the 101Hero and printed in spiral vase mode with 2 base layers using Cura 3.1.
Eventually I started to see some underextrusion due to my nozzle getting clogged.
I tried the "warm yank" method, where you set the hot-end temperature to about 50C, then release the extruder tension and pull out the filament. This worked well enough, but I was afraid that repeatedly opening and closing the 101Hero extruder door would wear out the screw holes way too fast.
What I'm doing instead is placing a pair of pliers (or anything metal) 1-2 mm below the nozzle then, at normal print temperature, extrude a small amount of filament to form a ball attached to the end of the nozzle (I use Pronterface to do the extrusion). Then I set the hot-end temperature to 30-50C, and when it gets there I pull straight down to remove the ball from the end of the nozzle.
This does a good job of cleaning the nozzle, with no need to unload and reload the filament.
I'm thinking it should be possible to do this automatically by printing a small part that has enough bed adhesion to resist the upward pull. Thoughts?
OMG, tree #40 is printing now. Somebody either stop me or turn me into an elf.