Thanks for your insights. It's really appreciated.
I have found that in practice, the UM2+ extruder does not slip or give under-extrusions, at least not yet in my usage.
It really is significantly different and better than the original. It is a different stepper motor, is, as you say, geared which gives it more torque, and uses gear teeth instead of a knurled bolt for biting into the filament.
Now that said, I have not yet done speed tests. And the Bondtech design might be even better, despite the UM2+ improvements. So that could be a reason to upgrade when/if I want to push my machine even further.
But I still wonder if anyone has directly tested both? Are they actually reasonable equivalent in real practice? Is once actually significantly better than the other?
I was actually considering buying the UM2+ upgrade since I was having all kinds of trouble with slipping feeder, under extrusion etc. I haven't actually tried the UM2+ feeder, but what I can see from the pictures its still somewhat the same kind of mechanism only that it is easier to clean.
It would seem that it could suffer from the same flaws as the original one. It has one shaft from the stepper and one bearing pressing the filament to that, essentially deforming the filament. It is geared as well, but that does not help for slipping.
If you have a look at the bondtech feeder, it has dual drive and will thus push the filament from both sides. The gripping wheels are also formed to "grip" around the entire filament without deforming it. Essentially it will grip the filament on all sides and push it really hard. I cannot see how this feeder will ever slip.
After upgrading my machine with bondtech and the new matchless heater block from 3D solex.... It's a completely new machine. It is extremely reliable and I can print at insane speeds. The bondtech feeder will pop the bowden tube before it ever slips.
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