How much extruder traction do we really need?

Idler hobb gear has an impact on extrusion consistency.
Do we REALLY need a second driven hobb gear in a direct drive extruder?

You want to learn and contribute to the HevORT project?

[zpbeats]

Seeing this printer print slowly is hilarious 😂 like a Lamborghini going 10mph

[dano]

Good question? For slow printing not much i guess. I will try only one traction side too in my new setup.

[OutsiderDreams]

The grip required is likely proportional to the backpressure you are creating.
When printing fast, and trying to push semi-molten plastic through a tiny hole, the back-pressure is quite high. That's where you need the grip/traction.

[ruftime]

All TPU work great on my Prusa i3mk2, with stock single drive gear/smooth bearing tensioner. But requires backing off the tension required for harder materials, which many find counter-intuitive😎

[TheJttv]

The flexion nozzels only have one drive gear and they work flawlessly.

[whdhdi]

I upgraded to duel drive gears because my extruder was slipping at higher speeds. I could have also probably switched to a higher flow hotend but I'll do that next time

[huntingislife]

Mig welders just have a grove in the drive wheels for solid wire and they can move it through 10ft of cable off a heavy spool

[cmtetaboaco]

My Anet A8 uses a slotted bearing agains a pinion kind of thing pushing it down, works fine

[spencerhanson]

I'm wondering if dual gear extruders became the trend when we hit the flowrate restrictions of the hotends of that time.

[Nikitaman]

I'm so exited about stuff you do lately, can't wait for the hotend/extruder which will result from that!
Any news about your talks with Bondtech?

[johnstapp]

I just bought some bearings earlier at Microcenter. I wonder if I should try the bearing idler and see how well it works for me.

[reyalPRON]

with that low speed and a bowden im impressed that you acchieve headpressure enough to print at all. kudos mate. im running an all printed herome gen6 and dualdrive direct extruder. got my gantry weight down by 155g😇

and i can feed ninjaflex at 50-75. not bad for a almost stringless print. great videos man! thanks for all your efforts😇

[EnergySeeker]

the small exhaust looks really good, do you have a STL for that

[rich]

In my experience, too much traction is bad on a bowden tube setup. It ends up chewing up the filament and adds friction.

[TheAndyroo]

I have some hard TPU on order (Shore D58) to print functional parts - idea being it will have the layer bonding of TPU but stiffness for functional screw threads etc. and will not crack if dropped. Do you have any experience with it or similar? (it's "Extrudr" TPU "Hard".

[swarfster]

Consider in a softer material the teeth have less resistance from the material to dig in. I would propose as the material becomes denser or harder the greater the number of teeth needed as they can’t dig in as deeply making each tooth less effective.

[alainthire]

Vector3D made a very good video exactly about that.

[nitroburner]

I think when your reverse bowden is short, you don't have a whole lot of friction, which should be the goal in all printers.

[NackDSP]

I measured the runout on my drive gear today. It was 1/1000", so that was good. I purchased bearings to do this mod today. Mitsumi sells them direct on their site. Did you use the 3 ID, 4 Wide, 7 OD bearings?

[mjb]

on a soft, compressible material, wouldn't a pair of smooth surfaces actually be better than the textured surfaces that a normal pair of extruder gears need to grip hard filament?