SteveG

Thanks, I'll give that a try. The second feeder is also a UM2+ original and it has the same problem. Looks good, just doesn't print (much)😂.

Hi, I’ve converted my UM2+ Extended to the DXU (thanks to everyone who contributed to this and the Mark2). I’ve adapted it to use 2.85mm filament using the information on the blog from @burdickjpand from @Klaasie regarding the heat break and 4mm OD 3mm ID PTFE tube. I’ve got the following problem with under extrusion and I hope someone can give me a pointer in the right direction. When I try to print something after about 10 layers, no more filament comes through and the printer carries on printing in thin air. I can change the filament no problem because the nozzle is not blocked. If I try an extrusion calibration of 100mm filament and the bowden tube is not connected to the headset then 100mm comes out of the bowden tube as expected. When I try the same test with the bowden tube connected and measure at the back where the filament enters the feeder (original UM2+) then only about 50mm goes through. I’ve tried 3 different heat break combinations (original AliExpress, 26mm Stainless Steel heat break, E3D V6 Titanium) with practically the same results every time. The PFTE Tube is 4mm outer and 3mm inner. PLA is from Colorfabb, if any more information is needed or photos then I’ll happily provide them. Thanks Steve