Has anybody tried 3mm filament in airtrippers filament drive for rostock? Has anybody tried 3mm filament in airtrippers filament drive for rostock? I've heard that 3kg is neccesary to get 3mm filament to extrude on a good extruder. My motors are rated 4.8kg/cm at 2.5amp max. My stepper drivers should handle up to 2amp with heatsinks and fan but hopefully we won't need all that amperage. Max torque when the motors are running on 2amps should be as follows: 4.8kg/cm * 2amp/2.5amp = 3.8kg/cms of torque. The filament drive gear I was looking at buying is 8mm in diameter, so it has a 4mm radius (shaft on motor is 5mm diameter = 2.5mm radius) So 3.8kg/cm / .4cm = 9.5kg of torque pushing the filament when the radius is 4mm. That should be plenty. A 13mm gear is also avaliable. If 13mm gear is used radius is 6.5mm so: 4.8kg/cm / .65cm = 7.4kg of torque. Which should also be enough. Any mistakes? Would this work? Is it practical? Or rather, has anybody tried this? TTN https://reprap.org/forum/read.php?178,276801,276801#msg-276801 Wed, 15 Jul 2026 15:16:12 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?178,276801,304091#msg-304091 Re: Has anybody tried 3mm filament in airtrippers filament drive for rostock? https://reprap.org/forum/read.php?178,276801,304091#msg-304091 TheTechnicalNoob Delta Machines Fri, 31 Jan 2014 15:00:22 -0500 https://reprap.org/forum/read.php?178,276801,296373#msg-296373 Re: Has anybody tried 3mm filament in airtrippers filament drive for rostock? https://reprap.org/forum/read.php?178,276801,296373#msg-296373 uncle_bob Delta Machines Fri, 17 Jan 2014 07:32:58 -0500 https://reprap.org/forum/read.php?178,276801,295608#msg-295608 Re: Has anybody tried 3mm filament in airtrippers filament drive for rostock? https://reprap.org/forum/read.php?178,276801,295608#msg-295608 The PLA prints without eating into the PLA or skipping with the current setup as posted above in the picture. Although probably not too well at higher speeds. Enough to get me printing with PLA so I'm happy B)

UPDATE 2: Well, it was working fantastic, but its starting to chew up the pla when doing super fast retract moves (500mm/sec) for other prints its still fine. Time to print a geared extruder drive..]]> TheTechnicalNoob Delta Machines Thu, 16 Jan 2014 03:43:45 -0500 https://reprap.org/forum/read.php?178,276801,289264#msg-289264 Re: Has anybody tried 3mm filament in airtrippers filament drive for rostock? https://reprap.org/forum/read.php?178,276801,289264#msg-289264 TheTechnicalNoob Delta Machines Sat, 04 Jan 2014 16:15:58 -0500 https://reprap.org/forum/read.php?178,276801,289257#msg-289257 Re: Has anybody tried 3mm filament in airtrippers filament drive for rostock? https://reprap.org/forum/read.php?178,276801,289257#msg-289257 EDIT: I though it was good, and thats true, for anything slower than 40mm/sec otherwise it starts to slip.

[attachment 24076 IMG_5678.JPG]]]> TheTechnicalNoob Delta Machines Sat, 04 Jan 2014 15:56:35 -0500 https://reprap.org/forum/read.php?178,276801,277210#msg-277210 Re: Has anybody tried 3mm filament in airtrippers filament drive for rostock? https://reprap.org/forum/read.php?178,276801,277210#msg-277210 uncle_bob Delta Machines Sun, 08 Dec 2013 09:53:50 -0500 https://reprap.org/forum/read.php?178,276801,277103#msg-277103 Re: Has anybody tried 3mm filament in airtrippers filament drive for rostock? https://reprap.org/forum/read.php?178,276801,277103#msg-277103
Quote
uncle_bob
It's the silly pound force thing all over, in this case it's kg used as force.

There certainly are a lot of reports on these forums of people who are unable to get those torque level motors to work on direct drive extruders with those gear sizes. With the units straightened out, that sort of leaves the 3KG starting assumption.

Yea that was really my question. I couldn't find any reports of people using it or trying it. But ok, so its not the best idea then. I'll go with a geared extruder then.]]> TheTechnicalNoob Delta Machines Sun, 08 Dec 2013 03:56:04 -0500 https://reprap.org/forum/read.php?178,276801,277043#msg-277043 Re: Has anybody tried 3mm filament in airtrippers filament drive for rostock? https://reprap.org/forum/read.php?178,276801,277043#msg-277043
There certainly are a lot of reports on these forums of people who are unable to get those torque level motors to work on direct drive extruders with those gear sizes. With the units straightened out, that sort of leaves the 3KG starting assumption.]]> uncle_bob Delta Machines Sat, 07 Dec 2013 19:13:46 -0500 https://reprap.org/forum/read.php?178,276801,276966#msg-276966 Re: Has anybody tried 3mm filament in airtrippers filament drive for rostock? https://reprap.org/forum/read.php?178,276801,276966#msg-276966 3.8kg x cm / .4cm = 9.5kg the unit cm cancels out as it should.
4.8kg x cm / .65cm = 7.38kg


To be technically correct kg isn't a unit of force, but gravity is present. So it does exert a force on it. Not that there is anything falling, but the unit kg has the assumption built in that we're on earth and gravity is 9.81m/sec^2
Force due to gravity:

Mass x gravity = weight (or rather force, in newtons)

3.8kg x 9.81m/sec^2 = 37.3 kg x m / sec^2 which is the unit newtons.
4.8kg x 9.81m/sec^2 = 47.1 kg x m / sec^2

But I tend to think with the unit kg x cm in mind when I'm dealing with stepper motors and reprap ^ ^]]> TheTechnicalNoob Delta Machines Sat, 07 Dec 2013 13:43:21 -0500 https://reprap.org/forum/read.php?178,276801,276881#msg-276881 Re: Has anybody tried 3mm filament in airtrippers filament drive for rostock? https://reprap.org/forum/read.php?178,276801,276881#msg-276881
[en.wikipedia.org]

You are delivering a required amount of force to the filament at the edge of the gear ....]]> uncle_bob Delta Machines Sat, 07 Dec 2013 09:37:51 -0500 https://reprap.org/forum/read.php?178,276801,276801#msg-276801 Has anybody tried 3mm filament in airtrippers filament drive for rostock? https://reprap.org/forum/read.php?178,276801,276801#msg-276801 I've heard that 3kg is neccesary to get 3mm filament to extrude on a good extruder.
My motors are rated 4.8kg/cm at 2.5amp max.
My stepper drivers should handle up to 2amp with heatsinks and fan but hopefully we won't need all that amperage.

Max torque when the motors are running on 2amps should be as follows: 4.8kg/cm * 2amp/2.5amp = 3.8kg/cms of torque.
The filament drive gear I was looking at buying is 8mm in diameter, so it has a 4mm radius (shaft on motor is 5mm diameter = 2.5mm radius)
So 3.8kg/cm / .4cm = 9.5kg of torque pushing the filament when the radius is 4mm. That should be plenty.
A 13mm gear is also avaliable. If 13mm gear is used radius is 6.5mm so:
4.8kg/cm / .65cm = 7.4kg of torque. Which should also be enough.


Any mistakes? Would this work? Is it practical?
Or rather, has anybody tried this?



TTN]]> TheTechnicalNoob Delta Machines Sat, 07 Dec 2013 03:11:45 -0500