Here are the relevant settings from our go-to nylon profile. If I were printing smaller things with more jumps I would probably drop the print speed 10-15mm/s and drop the nozzle temp 5-10°:
layer_height = .15
wall_thickness = 2
retraction_enable = True
solid_layer_thickness = 3
fill_density = 100
nozzle_size = 0.4
print_speed = 50
print_temperature = 255
support = None
platform_adhesion = Brim
filament_diameter = 2.88
filament_flow = 100.0
retraction_speed = 30
retraction_amount = 4.5
retraction_min_travel = 1.5
retraction_combing = True
retraction_minimal_extrusion = 0.5
bottom_thickness = 0.3
object_sink = 0
travel_speed = 150.0
bottom_layer_speed = 15
infill_speed = 50
cool_min_layer_time = 6
fan_enabled = False
skirt_line_count = 4
skirt_gap = 20
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nick-foley 5
I have a machine that is set up to print in 645 exclusively and we get pretty consistently great results. Some tips:
1) Your prints look fuzzy because the filament is spending too much time in the nozzle. You probably need to increase your extrusion rate. Also, this material does not like lots of small hops, since a section of filament will then spend a lot of time heating up in the nozzle before finally being extruded. Don't waste your time drying the material - we keep ours exposed to air and get solid, smooth prints every day. The only time we get foamyness is on the first few mm of filament in the skirt of each print, because the previously pre-heated nylon has absorbed a lot of water while molten.
2) Your filament is probably clogging because the diameter of the Nylon is too large. I haven't tried printing 645 on a fully stock machine - our "nylon machine" is a stock machine on which I've opened up the ID of the entire hotend assembly with a 3.4mm drill, and replaced the bowden tube with a thin-walled equivalent to give more clearance for the filament. We have never had a clog with nylon.
Anyway, our overall experience is that nylon isn't a particularly pretty material to print in, and it isn't a particularly great material for small/detailed prints, but it is an extremely useful material - it's strength, flexibility, and toughness enable amazingly high-functioning parts that totally transform what 3D printers are capable of.
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