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mixing nozzle vs dual nozzles

Posted by GITRDUN 
mixing nozzle vs dual nozzles
May 31, 2020 09:39AM
Why does the single nozzle mixing extruder seem to be less popular than using dual twin nozzles? I have no experience with either though i am getting ready to install a mixer. But it seems to me that a single nozzle dual extruder would be far easier and cheaper to use. Am i missing something?
Re: mixing nozzle vs dual nozzles
June 02, 2020 03:36PM
I think there are two significant problems with mixing nozzles:
  • It takes some time for the filament to be purged before printing can start with the next filament
  • There is little or no possibility to change the temperature, nozzle size and possibly other factors between filaments.
While your requirements may vary, I can find few things that would work within these limitations other than multiple colour designs..

Mike
VDX
Re: mixing nozzle vs dual nozzles
June 02, 2020 04:31PM
... one of my older ideas for "mixing" nozzles is based on a ring of several wire-feeders (not melting extruders!), pushing 0.3mm thick plastic wires to the same spot -- and a laser is heating/melting this spot, so the "combined" plastics will melt, intermix (different feedrates for different mixing params) and fuse to the underlying surface or already printed part structure smoking smiley


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]
VDX
Re: mixing nozzle vs dual nozzles
June 03, 2020 02:27AM
... here another interesting "mixing nozzles" approach smoking smiley

[www.youtube.com]


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]
Re: mixing nozzle vs dual nozzles
June 07, 2020 09:15AM
Well ive spent a few days playing with the mixing extruders and now realize why they are not more popular for the reasons stated in the replys. The amount of wasted material and time that goes into printing a prime tower is ridiculous. For a small part i had probably 3X more material and time in the prime tower than in the finished part. The qualtiy of the finished part is very good, but not worth the added time and material waste. I have since attached both my mixing extruders to an X carriage and switched to standard dual extrusion. I suppose i could add two more extruders and convert it into a quad extrusion if ichose but who needs 4 materials in a single print. Anyway, lesson learned and moving on. Least the mixer extruders were cheap.
Re: mixing nozzle vs dual nozzles
June 07, 2020 02:58PM
It's possible to cut that extra time dramatically. See [wp.me]



Large delta printer [miscsolutions.wordpress.com], Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
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