I’ve got a quick question for any owners of a filament extruder: What is the diameter of your auger and feed chamber. Everything I’ve read makes it seem like a lot of these extruders are using a 5/8 auger with 1/2 inch steel NPT pipes, but 1/2 inch pipes are supposedly .622 inches internally.
I made one. I ran the drill bit through the pipe to knock off excess. Not perfect but good enough. It works.
I did the same as Brook.
How are people finding these? I’ve still not seen the “here’s a thing I printed with filament I made myself” post, someone has to have done it.
Also, all the dimensions in the OP make me feel ill.
@Bracken_Dawson
Not filament I made myself, but I’ve printed stuff from filament produced with one of those extruders (filabot) and it appears to do fine. (I say “appears to” because it was 1.75 ABS, and my 1.75 machine really wasn’t getting its bed hot enough for ABS, plus my officemates don’t like the fumes, so I only did a little test print that clearly needed more work on temp and extrusion rate. I’ve got some 3mm that I’m going to run this week in the basement.)
Tim here, from Filastruder. Plenty of testimonials and photos of printed parts here:
Pretty much everyone uses a 5/8" auger and a 1/2" pipe, which has a nominal ID of 0.622", as you mention.
Some suppliers make augers slightly undersize, some suppliers make pipes with a slightly oversized barrel. That’s how it works - finding the right suppliers.
@Tim_Elmore Ah, that makes sense. I figured it must have had something to do with suppliers with under/over sizing.
I don’t know if this actually figures in here, but it’s a common practice to make the cutting edge of a bit full size and then to “relieve” everything behind that to avoid binding.
@paul_wallich that is my experience with some suppliers, yes,
I just ordered from the Bom for the Lyman extruder.