Removing filament while hot is a good idea.
Hand extrusion produces lots of filament very easily.
Best temp for extrusion seems to be about 220C. 240C produces brown filament and starts to 'stick' - seems to need more force.
Have left this warmed for 3hrs continuous, and seems to be fine so far.
Very little thermal inertia, so warms up quickly.
My RepRap >