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From: Dan Newman <dan.new...@mtbaldy.us>
Date: Sun, 18 Nov 2012 17:53:57 -0800
Local: Sun, Nov 18 2012 8:53 pm
Subject: Re: [MakerBot] Dualstrusion Print Quality Issues
On 18 Nov 2012 , at 5:25 PM, Hammerhead wrote:
> <https://lh6.googleusercontent.com/-6CAkOjzdcB8/UKmKevSShSI/AAAAAAAAAQ...>
> <https://lh6.googleusercontent.com/-v3E43eSyqfc/UKmKR6rJ0oI/AAAAAAAAAQ...>
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 some Would 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 can You 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? You must Sign in before you can post messages.
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