This is all 1.75mm talk to follow....
Depending on the part, keeping in mind you can have a 0.15mm layer height with most nozzle sizes, the end product could look almost identical with a .3, .4, or .5 nozzle. Lots of factors to consider, but it is important to remember the small increase in diameter of the nozzle makes a much larger increase in area of the opening (or volume as it is extruding). Sounds like most of the other posters already realize this, so this is more for those reading this stuff the first time perhaps.
What I noticed early on, is that you can print a 0.5mm nozzle with 0.25mm layer height print in around 25-75% of the time of a 0.3mm nozzle/0.25mm layer height. Varies widely, but its just a lot quicker in most cases.
I've heard some people just get a fine point and make the nozzle bigger, but then you'd be left guessing the size and would need to do some (perhaps lengthy) calibration. Still, I don't see 0.6mm nozzle size for sale all that much. Keep in mind the plastic should expand a bit when extruded, so a 0.5mm nozzle will spit out a larger size (0.51 or 0.66, not sure, but it should be a bit bigger).
If you are making 3d parts for other printers, I think doing them in 0.25 or even 0.35 nozzles may just be wasting time. Then again, if I had it to do over again I might have just gone to 3mm filament to begin with, so I could get super large nozzles.
If you get a non-jhead, you'd only be wasting $3-5 to drill or poke a larger hole in a removable nozzle. I bet 1/2 is a good rough starting point.
Depending on the part, keeping in mind you can have a 0.15mm layer height with most nozzle sizes, the end product could look almost identical with a .3, .4, or .5 nozzle. Lots of factors to consider, but it is important to remember the small increase in diameter of the nozzle makes a much larger increase in area of the opening (or volume as it is extruding). Sounds like most of the other posters already realize this, so this is more for those reading this stuff the first time perhaps.
What I noticed early on, is that you can print a 0.5mm nozzle with 0.25mm layer height print in around 25-75% of the time of a 0.3mm nozzle/0.25mm layer height. Varies widely, but its just a lot quicker in most cases.
I've heard some people just get a fine point and make the nozzle bigger, but then you'd be left guessing the size and would need to do some (perhaps lengthy) calibration. Still, I don't see 0.6mm nozzle size for sale all that much. Keep in mind the plastic should expand a bit when extruded, so a 0.5mm nozzle will spit out a larger size (0.51 or 0.66, not sure, but it should be a bit bigger).
If you are making 3d parts for other printers, I think doing them in 0.25 or even 0.35 nozzles may just be wasting time. Then again, if I had it to do over again I might have just gone to 3mm filament to begin with, so I could get super large nozzles.
If you get a non-jhead, you'd only be wasting $3-5 to drill or poke a larger hole in a removable nozzle. I bet 1/2 is a good rough starting point.