Mooner's J-tripper Extruder

by mooner, published

Mooner's J-tripper Extruder by mooner May 1, 2013
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First off, thanks to Airtripper for a great compact extruder design!

This is my J-tripper -- a remix to the Airtripper design to allow for DIRECT mounting of a J-head (or similarlly slotted hot end) to the bottom of the Airtripper direct-drive extruder. I made this design to replace the finicky parts that I encountered on the Mk 7 / QUBD extruder designs.

I built mine using a Makerbot MK7 Drive Gear.

Visit http://airtripper.com/?p=367 for extruder body build details.

Once the extruder body is assembled and mounted to the stepper motor (as in Airtripper's instructions), simply slide the J-head hot-end into the bottom slot.

I consider this version "Beta" as I have only been using it for a few days. But it seems reliable so far, so I'm releasing it to the public. As the design is proven and updated to the Airtripper V3 core, I will also release the OpenSCAD file.

This is the reference extruder design for the F3 CubeMax (come see us at MakerFaire San Mateo 2013).


Assemble using Airtripper's instructions here:

Then slide in your hot end!

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it might be an optical illusion; how is the stepper motor mounted?
it looks like there's not enough room behind the extruder.

Hi Boxx-

It's back there...

The stepper is sandwiched between the extruder body (this thing) and the acrylic plate you see in the photo. I think the photo just makes it really hard to see. The motor being screwed into carriage plate is how the entire extruder is mounted to the X-carriage. In retrospect, acrylic was probably not the ideal material for the X-carriage plate. It has a tendency to flex a bit, so the extruder is not held rock solid vertically as it moves. This can lead to sloppy prints.

I have since replaced the X-carriage plate with 4mm aluminum plate -- works much better.

Boxx - in reply to Erik

Ah. that makes sense... all is good with the thingiverse again.

This version seems to work fine... So posting the SCAD file here.

I think it could be made a little sturdier -- so will continue to evolve the SCAD. But here's the file as-is...

Any chance you can add your SCAD file? :)

One the design is "proven" I will definitely post SCAD file. If you have a particular need for it now, I might be convinced to send it to you via email...

I'd also like a copy of the SCAD to play with - have a non-standard hotend