I have used my Mendel90 printer with .4mm and .6mm nozzles and there is a lot of difference in the print time and quality.
I thought some time ago that it could work to have 2 extruders which instead of having different colours as is usual had different nozzle size so that the main body could be printed at low resolution and the outside with a fine nozzle.
I didn't follow up my thoughts in the area being too busy with other things but a friend recently referred me to a commerial printer using that idea. [robox.cel-uk.com]
I was wondering if anyone had implemented this on a reprap open source design?

Edited 1 time(s). Last edit at 05/12/2014 06:58AM by Ralph.Hilton.

Have you tried using the 0.4mm nozzle for 0.6 prints? I use 0.3 for prints up to 0.5 and it still looks very good.

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[www.bonkers.de]
[merlin-hotend.de]
[www.hackerspace-ffm.de]

You can do just that in the newer versions of Slic3r.

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