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Current state of Y-splitter dual extrusion scripts?

Posted by sungod3k 
Current state of Y-splitter dual extrusion scripts?
March 29, 2019 10:34PM

2 years ago I got myself parts for dual extrusion with a y-splitter like this or this . The main issue with this system was that the pulling out the filament out of the hot nozzle would leave strings that would hinder feeding the material back in. This was mainly concerning PLA, I also tested ABS which had less stringing but wasn't perfect in that regard.

There were some different approaches:

*cooling the hotend down, so the material is less viscous and therefore disconnects more cleanly, but that took to long and wasn't practical
*pulling out fast or pulling out really slow
*pull out fast and then feeding back in to form a small plug with the stringing or feed in and out in fast succession to achieve the same
*and all combinations thereof

Since the y splitter setup still seems one of the cheapest and simplest systems (at least from the hardware side) I wonder if there has now formed some consesus or if there is more experience with the setup now?
On the other hand it is not encouraging that prusa abandoned this approach for his multi material upgrade. I also never got straight answers from them when i asked how they were dealing with the stringing while the were still working on MMU V1
Re: Current state of Y-splitter dual extrusion scripts?
March 30, 2019 03:47AM
Isn't a 2-input mixing hot end just as simple, without suffering from the problem you describe?

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
Re: Current state of Y-splitter dual extrusion scripts?
March 30, 2019 12:14PM
Well im thinking about getting a 2nd smart effector but 2 way mixing requires a new hotend and the e3d cyclops isnt cheap. although testing the concept with a china hotend will probably do. Also Im not sure if one still needs to feed both channels at the same time to avoid the hot filament escaping upwards into the 2nd channel. Needing a 2nd spool of filament of the same type just to feed 5% into the 2nd channel, seems expensive.

and talking about the smart effector, im really tempted to go for a super volcano first before I get a mixing nozzle. #1stworld3DprinterProblems grinning smiley
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