I have always wanted to try printing larger, using a bigger nozzle - just got around to swapping to a .6mm in my MK3S+. Printed a gift for a childhood friend. 300% size. Took just under 10 hrs. With the slicer settings on .4mm it was over 17hrs.
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When it works, it's pretty great. I've got a weird overextrusion issue to fix on my MK3S+ with the 0.6 nozzle, but the prints themselves are tougher and faster.
Did you play around with different filament settings or presets? Most importantly extrusion multiplier?
Measuring the filament might be a good idea too, maybe slight differences are becoming visual with a bigger nozzle
Thanks for the ideas, yeah I've tried playing around with the presets and such, and I'm fairly certain the filament itself is good, matterhackers pro PETG.
When I have a moment I'll be trying to make an extrusion tower to test settings.
PETG is very leaky. It's not a big deal with 0.4, but becomes a pain with 0.6. Try to set a higher printing speed.