If thats ABS I would really like to aim for results like that! Would you be willing to share your settings and details you think were critical to achieving that? Out of curiosity - whats the part?
Thanks

Yes, ABS.  It is a segment of this octopus (but printed at 2X scale in the fan experiment).  Below are my current Slic3r settings (exported to an ini file).  I generally have to tweak the temperature and flow rate, though, for different brands of ABS.  For example the print above was at 205C and 97% flow rate but some ABS requires 230C and 110% flow to get similar results. 

# generated by Slic3r 1.1.7 on Sat Feb 28 07:03:01 2015
avoid_crossing_perimeters = 0
bed_size = 200,200
bed_temperature = 100
bottom_solid_layers = 4
bridge_acceleration = 1000
bridge_fan_speed = 100
bridge_flow_ratio = 1.2
bridge_speed = 75
brim_width = 0
complete_objects = 1
cooling = 1
default_acceleration = 1000
disable_fan_first_layers = 1
dont_support_bridges = 1
duplicate_distance = 6
end_gcode = 
external_perimeter_speed = 40
external_perimeters_first = 0
extra_perimeters = 1
extruder_clearance_height = 20
extruder_clearance_radius = 20
extruder_offset = 0x0
extrusion_axis = E
extrusion_multiplier = 1
extrusion_width = 0.4
fan_always_on = 0
fan_below_layer_time = 30
filament_diameter = 1.75
fill_angle = 45
fill_density = 50%
fill_pattern = rectilinear
first_layer_acceleration = 0
first_layer_bed_temperature = 105
first_layer_extrusion_width = 150%
first_layer_height = 150%
first_layer_speed = 50%
first_layer_temperature = 205
g0 = 0
gap_fill_speed = 30
gcode_arcs = 0
gcode_comments = 0
gcode_flavor = reprap
infill_acceleration = 1000
infill_every_layers = 2
infill_extruder = 1
infill_extrusion_width = 0.4
infill_first = 0
infill_only_where_needed = 0
infill_speed = 60
interface_shells = 0
layer_gcode = 
layer_height = 0.197556
max_fan_speed = 100
min_fan_speed = 35
min_print_speed = 25
min_skirt_length = 0
notes = 
nozzle_diameter = 0.4
only_retract_when_crossing_perimeters = 0
ooze_prevention = 0
output_filename_format = [input_filename_base].gcode
overhangs = 1
perimeter_acceleration = 1000
perimeter_extruder = 1
perimeter_extrusion_width = 0.4
perimeter_speed = 60
perimeters = 4
post_process = 
print_center = 100,100
raft_layers = 0
resolution = 0
retract_before_travel = 2
retract_layer_change = 1
retract_length = 2.5
retract_length_toolchange = 3
retract_lift = 0
retract_restart_extra = 0
retract_restart_extra_toolchange = 0
retract_speed = 150
seam_position = nearest
skirt_distance = 0.5
skirt_height = 1
skirts = 5
slowdown_below_layer_time = 30
small_perimeter_speed = 40
solid_fill_pattern = concentric
solid_infill_below_area = 10
solid_infill_every_layers = 12
solid_infill_extrusion_width = 0.4
solid_infill_speed = 60
spiral_vase = 0
standby_temperature_delta = -5
start_gcode = 
support_material = 0
support_material_angle = 0
support_material_enforce_layers = 0
support_material_extruder = 1
support_material_extrusion_width = 0.3
support_material_interface_extruder = 1
support_material_interface_layers = 0
support_material_interface_spacing = 0
support_material_interface_speed = 100%
support_material_pattern = rectilinear-grid
support_material_spacing = 2
support_material_speed = 60
support_material_threshold = 30
temperature = 205
thin_walls = 1
threads = 2
toolchange_gcode = 
top_infill_extrusion_width = 0.4
top_solid_infill_speed = 50
top_solid_layers = 4
travel_speed = 75
use_firmware_retraction = 0
use_relative_e_distances = 0
vibration_limit = 0
wipe = 0
z_offset = 0

mdrVB6 wrote:

I have heard that the fan helps with bridging

Yes.  I recently did a controlled experiment and the result show the fan to be very impactful for overhangs.  Both prints are identical (print 4 identical parts without supports) in all ways except one was with the fan and the other without.

If thats ABS I would really like to aim for results like that! Would you be willing to share your settings and details you think were critical to achieving that? Out of curiosity - whats the part?

Thanks

mdrVB6 wrote:

Looks like a nice fan mount but it won't fit the SD2 or 3...<snip>...  It looks like you loose a good bit of X travel anyway.

The stock fan does limit X travel so there is a good argument to removing it once you upgrade to E3d (I wish I had realized this before designing the shroud - some day I will design a new one).  My fan shroud design actually doesn't limit the X any further than the stock fan - all the hardware slides underneath or in front of the Y carriage.

Hi TickTock!

I just found your shroud today, been looking for something like this!  I posted a question on the thingiverse page asking if it will still work with the Lawsy MK5 extruder.  Do you know if it will?

Thanks!  Looks like a great design!

Looks like a nice fan mount but it won't fit the SD2 or 3...<snip>...  It looks like you loose a good bit of X travel anyway.

The stock fan does limit X travel so there is a good argument to removing it once you upgrade to E3d (I wish I had realized this before designing the shroud - some day I will design a new one).  My fan shroud design actually doesn't limit the X any further than the stock fan - all the hardware slides underneath or in front of the Y carriage.

You're aware slic3r has logic for when and how fast to run the fan right? It's called PWM GCode control. The printrboard doesn't have the pinouts but you can solder them.

We'll I am aware now.  :-) Thanks!  I'll go look for it.

That "V6" fan guard looks pretty sweet.  Can I have the source for that?

Not my design - got it here: http://www.thingiverse.com/thing:607114

Its just not needed to run a fan the entire time when printing ABS and might actually hurt when doing the first layer.  I would only need it to run while printing bridges or overhangs.  There is a slic3r setting for this.

Edit: That "V6" fan guard looks pretty sweet.  Can I have the source for that?

Yes.  E3dv6 on stock SD4 carriage.  Using a 40x40x10 fan and this fan shroud.  Why do you want the fan to be switched?  Why not just leave it on all the time?

You're aware slic3r has logic for when and how fast to run the fan right? It's called PWM GCode control. The printrboard doesn't have the pinouts but you can solder them.

You don't want or need the fan always on. Sometimes the heat is actually beneficial(think fast infill and the first layer).

I have heard that the fan helps with bridging

Yes.  I recently did a controlled experiment and the result show the fan to be very impactful for overhangs.  Both prints are identical (print 4 identical parts without supports) in all ways except one was with the fan and the other without.