I Need Help With Multi Material Printing

[curious aardvark]

are the extruders dual gear extruders ?

I've got a bmg dual gear extruder on the sapphire pro.

I'm not convinced it's better than the mk8 on the delta.
The double gears definitely seem to grind a lot more then the mk 8 (7 ? - hang on)
this one:

delta extruder.jpg

That is hands down the best extruder from all 6 machines.


I think I'm up to about 8km through a 16 inch(ish) bowden tube. Never a single issue.

Whereas the bmg - only worked at all with it's bowden tube, when screwed right down to the point I can't turn it any more.
Plus grinds both sides, and it's still got a 2mm gap between the gears and the feed hole that the slightest back pressure causes flexible filament to bulge out of.

I'm going to strip it down and see if there's anythign I can do to block the gap.

Now it's direct drive, it's only got 105 mm tube that's vertical straight, so I don't have to screw it as tight.
But the gap needs blocking.
As it won't print flexibles at anything past 12mm/s.
The fixed mk8's on the klic-n-print happily knock it out at 30mnm/s.

I think sometimes the expensive, fancy extruders just don't work as well as the original simple ones.
manufacturers try and fix problems that didn't actually exist in the first place.

One other thing that might be relevant.
The bowden tube on the delta has a slightly wider bore than the one on the sapphire pro 2.
So there's very little friction on the delta and there was a lot on the original sapphire setup.

Could be an issue.