In this video I show 3d printing with polycarbonate filament and my results.
Note that to reach the extrusion temperature required by polycarbonate, you need an all-metal hot end.
I use a watercooled e3d V6 which works perfectly.
A stock e3d v6 will work as long as you have good cooling of the heatbreak heatsink.
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https://www.youtube.com/watch?v=ojVPu8dD7ns