First, I'm trying to figure out what kind of extruder I have and what my nozzle size is. I bought the printer from the 2nd owner - he doesn't know.

If I let some filament ooze out of the extruder and measure it, I'm getting 0.5mm. I've done that several times with short strands and long strands, pretty much 0.5 mm. Is that really the nozzle size, or since it's not really being extruded under pressure, is the nozzle smaller?



I also don't know what kind of extruder I have:



Is this the type of extruder where I can change out the nozzle? If so, where's a good place to look for other sizes (like may 0.3mm)?

Thanks,