Extruder for Planetary Gearbox (Modded Airtripper's)

by piit79, published

Extruder for Planetary Gearbox (Modded Airtripper's) by piit79 Nov 9, 2012
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This is a modification of Airtripper's Extruder for NEMA 17 stepper with a planetary gearbox (21 mm hole spacing)
2 tube attachment versions are available:
-- M4 nut
-- M5 Pneumatic push-fit adapter


I printed in PLA with a 0.5mm nozzle, 0.2mm layer height, 100% fill.

You need:
-- 2x M3x6
-- 3x M3x25
-- 2x M3 nut
-- 2x M3 washer
-- 2x M3x45
-- 2x spring or piece of rubber diesel pipe (see Airtripper's original)
-- M4 nut or M5 pneumatic push-fit adapter

Please note, this version doesn't use a support bearing yet - I didn't have a small enough bearing to fit the narrower hole spacing and 8mm gearbox shaft. I will upload a revision soon.

Updated: added a version for M5 pneumatic push-fit adapter

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My question: Why it the tallest M3 screw hole, so tall? The one under the out-feed.

Good point :) Not really necessary, guess my OCD dictated that the screws be same length / screw heads at the same level ;) It could easily be made lower to save material and use shorter screw without effect on rigidity.

Thanks for uploading with source. I am going to use with 3mm filament (after a few mods to the source). Having a place to start is not just making it easier, it is making it possible. If it is possible,

My pleasure, it's a great feeling when one's work is useful to others :) It should definitely be possible with a geared stepper (enough torque for the slower feed), you just need to enlarge the feed in/out holes and move them about 0.6 mm away from the feed gear to keep the filament path straight.

very nice!

how many steps/mm are using?

Thanks! I can't remember the setting, I haven't got the printer connected up at the moment.

What motors is everyone using for these?

Great. I added a couple of reinforcements between the back screw holes and also the side filament entry point since that broke on my airtripper. I don't think it needs the top bearing. The shaft isn't long enough on my motor anyway.

Petr, many thanks. Would it be much work for you modding the airtripper/gearbox for using a pneufit (M5) instead of the M4 nut?


 Hi ="thingiverse-4daab94b22b63a9e47c1762083a4c9e0:disqus" href="http://disqus.com/thingiverse-4daab94b22b63a9e47c1762083a4c9e0/nargos, you're welcome. It should be very easy to modify the attachment for the pneufit adaptor. I might actually get some myself... So the adapter has M5 thread, yes?

I have now uploaded updated version for the M5 pneufit adaptor. I made the hole 5.1mm diameter which should probably work fine - unfortunately I haven't got time to test it at the moment... I was also unsure about the thread length - I guessed 4mm. Please let me know if it works :)
Thanks for linking the eBay item - I quickly googled but couldn't find the pneufit in M5 - this item is even from a UK seller :)

Many thanks again, the Pneufits are shipped today. So I think I can say end of the week, if it works!

No problem, happy to help. I ordered a few as well so I might even be able to test them before you get yours :)

Petr, you're the man!!!! Many thanks,  but I think the hole for M5 should be 4,5 mm. M5 has an outer diameter of 5 mm. Or I'm wrong?

Of course you're right. I actually made the hole 4.9mm dia probably because I got used to my printer making holes slightly smaller.
I have now re-uploaded the body with a 4.5mm diameter hole.

Yes the adapter has M5 thread.