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On 18 Nov 2012 , at 5:25 PM, Hammerhead wrote:
In the second picture it looks like a large bridge over nothing? You need to have a
more solid fill layers to do that well: otherwise, with acceleration, there's not a
lot for the plastic being extruded to be drawn out against. (To some extent it gets
tacked down and then stretched.) You need to have some internal fill: maybe 10%?
> When doing a dual extrusion print with Sailfish, I'm finding that someWould take an examination of the gcode to see what's different. My guess is
> print surfaces come out just awful. See the attached photo 4064. is this
> a problem with my model? If so, why doesn't this characteristic reveal
> itself when printed alone without dualstrusion?
that you got slightly different print speeds and acceleration profiles and
that made all the difference in trying to get that large span to work. You
need to have some internal fill to help provide something to draw the plastic
out against, or have 5+ solid surface layers. Also, it could be an issue
with the extruder temperature. (When running two extruders and keeping them
plus the HBP heated and having 5 stepper drivers enabled, the rep 1 seems to
behave a little differently -- an issue with the PSU not quite having enough
oomph most likely. Not that much differently, but I've seen the voltage drop
down a bit at times when I put it on a scope.)
> The second problem I'm having is how to deal with eliminating 'dribble'There's really nothing that works well to eliminate that: the extruder's
> from the second extruder when printing two colors.
melt chamber is under pressure and the only effective way it has to relieve
that pressure is to push plastic out the end of the nozzle -- the dribble. Even if
you slowly keep on retracting the filament, that doesn't help: the solid
filament just separates from the molten plastic in the melt chamber -- it
only pulls/reduces the pressure by a small ammount. (We've tried this and
found it doesn't help.)
> So, what am I doing wrong with the Dualstrusion programming, and what canYou can manually wipe the nozzle as the print starts, but that's about it.
> be done to prevent the 2nd color from fouling the part prematurely?
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