Dagnall Y Extruder

thingiverse

This is a simple Y extruder, building on the excellent work from others. I liked the PTFE sleeved design of the flux capacitor, but found it very difficult to make the 8mm PTFE parts with accurately drilled 2mm holes. The un-sleeved designs, I thought, might suffer from wear. So this design relies only on easily available 4mm diameter by 2mm id Teflon tube, as used in most bowden systems. The Y part uses a split part of tube to gently feed the filament into the combined hole. The Cut-away photo shows how it works. After I saw Gimle's nice version http://www.thingiverse.com/thing:2326087 I have been re-designing this and have added a Printable M10 bowden connector. This fits the M10 version of my Y, and also the inlet of the E3D extruder (at least those with M10 threads!). The big advantage of this is that it allows for fewer tubing transitions, which can be beneficial in terms of print quality. I am working on making a set of .Json files for Cura 2.4(+) to make printing with this work. So far, I have the setup accepting that I have dual extruders and retracting etc as the extruders are switched. However, I do have some trouble with filament stringing (I am testing with ABS), so I have a push pull motion programmed in the JSON's to try to avoid this. Cura 2.4 had maths issues with centre-zero Delta printers, but I am hoping that 2.5 will have cured this. Cheers! Originally designed using 123D, I have moved to Fusion 360 and been very impressed with its capabilities. The bowden coupler, which has both straight and tapered threads, was very simple to design and works well if your printer is reasonably well calibrated.