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anthem

Dagnall Y Extruder M5 Edition

by anthem Aug 3, 2017
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I've got a 5 into 1 manifold block if your interested in multi filament combining manifolds. You don't need any infeed fittings, all built into the print.
https://www.thingiverse.com/thing:2403517

Multicolor Filament (5 color) Extruder Feed Block for Bowden Hotend

Nice, I should have made an M5 version!.
How well is it working for you in practice?
Because of the long retracts when I used mine, I started developing the Dag GBE extruder that should hopefully prevent all filament grind.. ?
Also, have you got an optimised extract routine for forming the ends? the one I put on the github still forms fairly long strings, but I am working on it!.

I haven't given it a good test yet, just got it installed last night. But no, I haven't worked out a great string prevention technique yet. Mostly I retract 6 mm quickly (600mm/min) at first, then perform the rest of the retraction (with my old Y that was 110mm) more slowly. Seemed to work fine for me. My big trouble was the filament getting hung up inside the Y splitter where the push fitting screwed in because the internal diameter was too large, and left a small gap before the push fitting. I'm thinking this design will work much better.

The best string free retraction I have seen pushed the tip back into the melt for a very little bit after the fast initial retract.. Trouble was I did this by hand and have not been able to create a precise and repeatable mechanical sequence to get the same effect. I'm hoping that my force measurement system will allow me to eventually measure exactly what's going on so I can write the correct sequence of push pull. For now I'm trying to overcome a print bed levelling issue (I think) that is (again I think) causing warp on large prints.
Re the 6mm fittings.. I usually put a chamfer on the entry to guide the filament in.. ( or the fittings already have a small chamfer) ..
It may be that by chance this is a better smooth entry approach than is possible with the smaller diameter 5mm fittings?