Top mount Airtripper for 5:1 geared nema 17 stepper

by RatInDaHat, published

Top mount Airtripper for 5:1 geared nema 17 stepper by RatInDaHat May 8, 2013
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I made some changes to the AriTripper v3 extruder. I enalbled it to be mounted at the top of my mendel max. I also changed the m4 nut for a m4 rivet nut. Finally, i made it compatible with the 5:1 planetary geared stepper from phidgets. http://www.phidgets.com/products.php?category=23&product_id=3325_0

The only part that changed was the main body. everything else is the same.

I'm using the TL hobbed gear with 8mm ID as it fits the motor shaft.

If you want to mount two, i recommend printing the regular and mirrored version that i posted. Let me know if you have any questions.

printed at .25mm layer height, 30% infill, 2 shells, no support.

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How did you connect the planetary gear to the main body? Is it even mounted to the extruder, or are the two separately mounted to your printer frame? My planetary drive has 4 mounting holes spaced 20mm apart, but I don't see how that would align with this model. Nice work, though, I hope to try using this!

the steppers i am using have the hole circle diameter at 28mm. There are mounting holes in the part to use three of those.

Ah. I see now. And those three screws, do they support the full weight of the stepper? Or is the printer frame taking some of the load?

They support the stepper fully.

How is the geared motor treating you in general? Do you recommend it?

IT seems to work pretty well. The issue i have, which i think might be motor based, is retraction speed is not fast enough to release the pressure in the hotend when i am changing layers so i always get a little but of extra material when the head stops. IF i up the acceleration then the motor makes fun noises and doesn't retract. So it is a bit of a tradeoff.

Yeah I had the same issue with a discontinued geared pollin, to then point where it didnt noticebly retract in any setting. what the max retraction speed you can get out of it?

and on the other hand how is the extrusion speed now?

i have the max speed at 200mm/s, max accel at 200mm/s^2 and jerk at 0.3

if i increase the jerk or acceleration it seems to behave poorly.

200mms is pretty good i would say.

im using the big droopy vulcano nozzles atm and Im happy with 80mms retraction with my 3,5:1 geared extruder. so should 100mms retraction not be totally enough for any purpose?

and how come you acceleration is so low, looks like a sturdy machine you have there :D

Accel for the extruder i recall being an issue, but it has been so long since i calibrated all of this that maybe i need to do some test prints again. it might be way too low and that could be from a update to my firmware and i never fixed it. I'll playwith that soon as i need to print some parts anyway. if i can up it, that should hopefully help with the blobs a bit.

ah interesting, i didnt notice that there is acceleration on the extruder as well. but if thats the case 200mmss would of course totally limit the speed of the retract.

What are you using on the carriage hot end side?

Mendel Dual groove mount holder and bowden tube

Where can one obtain the hobbed gear?

ultibots, trinity, makers tool works, etc. for the geared stepper you need the 8mm shaft version, or to be able to drill it out to 8mm.


it is possible have the .SCAD sources file?


I don't use scad. I do have the solidworks file.

you can attach the project solidworks please?

Is this still compatible with a nema17 motor without a planetary gear reduction?

not completely. Give me a few minutes and i will upload a version that is.

Shoulder? I'm not sure what part of the motor you are referring to. Aren't Nema17 motors identical dimensions aside form motor depth and shaft length?

they should be. There is a shoulder on the face. I'm talking about the raised section that the shaft sticks out of.

Ah, I understand. Now that I think about it, I have seen some ebay motor shipping with strange flush mount plates reducing motor shaft length and other weird variations from time to time. Thanks for the info, I've been considering adding bowden to my max for a little while.