That's a cool test... thanks for share! I was thinking to try this until I find your post a couple of days ago.
Have you ever tryed Bondtech feeder? Cause those MK8 looks like the Bondtech gears (but just gripping one of the sides).
I know that Bondtech gives much more torque... do you know the diameter/ratio of those? Cause as far as I know Bondtech is
a very good gear for TPU and soft filaments. Did you test this MK8 for 1.75mm or 2.85mm? I found those difference sizes ratios
to grip the filament:
and that one, well machined from E3d, is for 1.75mm (internal ratio 3mm; external ratio 3.5mm) for 8mm shafts:
By the way I will try the knurled wheel with Meduza's feeder and see how it perform. Bondtech doesn't ship to my
country but when I trip to Europe or USA I can grab one, if necessary
I'm just curious if you keep the same setup or did you test anything else?
Oh yes, I've been using this setup all the time since I built my printer.
When I did so, I installed the feeder unit as the designer meant it to be installed, with the knurled wheel toward the inside of the filament loop. I've never had any problem with the feeder!
As there was complains about to lo torque at the feeder, I just installed a 1.8 deg. stepper motor (200 step/rev) (At that time I did not have a 400 step/rev stepper). So I used a belt gear with 2 pulleyes (1:2 ratio) and same belt as used for the X/Y steppers (the short belt). This to avoid to many different parts and to lift the feeder a little bit higher (can use shorter bowden tube, if you want = less friction).
By doing this, I was able to use exactly same firmware as the original UM2 with better torque for the feeder and avoiding a "heated" knurled feeder wheel.
Today I can lift and lock up the roller and feed the filament easily all the way to the extruder using the original UM2 feeder unit. Yes, this original feeder unit is good!
Here's the little test print that Wizard bought up for us to use.
I've just used standard adjustments with lo temp at nozzle 0.25, 70 micron at 183 deg. C., so here's a little stringing and some opening in the top layer. But overhang and angles is perfect, those printers is great!
Happy printing and New Year!
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