Airtripper's Bowden Extruder V3

by Airtripper, published

Airtripper's Bowden Extruder V3 by Airtripper Dec 13, 2012
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Airtripper Bowden Extruder BSP Edition


Extruder Filament Drive Gear Review & Benchmark


Drive Gear Review & Benchmark

Welcome to the Airtripper's Direct Drive Bowden Extruder V3.

A few adjustments have been made to the design to make the extruder easier to set-up and use. Also, tweaks have been made to get a much cleaner 3D Print.

More details are on the blog:



Designed to fit NEMA 17 Stepper Motors, and can accept the Raptor Universal Filament Drive Gear and other similar size drive gears. For 1.75mm filament only.

STL File Content Details

airtripper-extruder-v3.stl Main body only
airtripper-extruder-v3_e_a.stl Extruder and axle
airtripper-extruder-v3_i_s.stl Idler and Strut
airtripper-extruder-v3-all.stl All parts included
airtripper-extruder-v3-axle.stl Axle only
airtripper-extruder-v3-idler.stl Idler only
airtripper-extruder-v3-idler2.stl idler with flange only
airtripper-extruder-v3-strut.stl strut only

Full parts list and assembly instructions are here:

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I might have looked over it, but is there a way that I could get the cad files for this? I don't want to mount it with bolts, I want to mount it to an aluminum extrusion

Has anyone successfully used the E3D hobb goblin gear with this? It has very sharp teeth, might be better than an MK8. Also, has anyone remixed an idler that uses a 605ZZ instead of a 608ZZ? I've got a bunch of 605ZZ's around but no 608ZZ's. Thanks for any info!

you can easily get 608 bearings (they are a skateboard bearing and can be found at zumiez in the mall or any skate shop & a pack of 8 is less then 10 bucks). As far as the bolt, I cant comment. Hope this helps :)

I saw that you recommended the mk7 driver gear, however I have only the mk8. Have you tried with this one? Are any recommendations or tweaks necessary in order to make this driver gear work?
Thank you!

What about printing 1.75 pla flexible with bowden with it? (It is not a joke, is my configuration :( ) Has anyone tried that?

I bought Airtripper extruder on ebay and now I have to remake the main peace, but mine has a different shape around bowden fitting connector. Where can I find my version?

Did you ever find this, as mine has a PTFE fitting there and I'd like to drill it out to run PTFE all the way to the hobbed bolt, but I don't want to do that unless I can make a replacement when I screw it up ;).

Found it:

Airtripper Bowden Extruder BSP Edition

Why is it when I try to download, all I get is trust certificates?

I think that's the default association for STL files; try downloading netfabb and STLs will open with that from now on.

OMG. Great design. PLA filament just feeds in and out the other end! No futzing with it once the pressure is dialed in. Great design!

You mention you can use coil springs instead of diesel hose. What sort of coil springs are these?

I tried springs from cloths pegs, they where very strong, and they worked well enough for tension.

However, using springs makes it very difficult to fit the idler and makes filament changing very awkward.

I recommend using diesel hose because that is what I have tested, but you could use any sort of soft rubber or silicone mat type. The hose provided good idler tension and the idler could be removed easily to change filament.

I drilled the holes in the tube with 3mm metal drill bit, using a dremel and goggles.

I read that this is designed for direct drive. will this work with a geared stepper with a 8mm shaft? looking for 1.75mm filament.

I just answered a similar post on my blog http://airtripper.com/1071/airtrippers-bowden-extruder-v3-updated-design/#comment-543http://airtripper.com/1071/air....

For your geared stepper motor you will perhaps need this modified version which looks solid enough:


Airtripper Mount for Kossel Mini

What would i have to change to make the middle hole the right size for the for the mk8 drive gear?

changes should not be necessary for this drive gear. However, due to the small diameter, the filament will slightly wrap the idler bearing instead of the drive gear. The misalignment is less than a millimetre and should not be a problem with a good hot end.

Is there any reason why this can't be adapted for 3mm filament? Was it done in openscad and if it was, is it possible to get the source to make the changes?

That filament guide in the picture seems like it's perfect to build this. I can't seem to find it anywhere. Does anyone happen to know where it came from?

You can find that filament guide part here: http://www.thingiverse.com/thing:34356http://www.thingiverse.com/thi...

Sumpod 3D Printer Filament spool rack

Awesome! Thank you. Making one now and putting it on a Rostock.

Why the change from the model boat part for the drive gear?

The QU-BD Raptor gear and the MK7 gear perform much better when there is difficulties with filament or the hot end.

I think it's just best to have the best part for the job to cut hours of tuning going forward.