Mooner's J-tripper Extruder
by mooner, published
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 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).
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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.
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Then slide in your hot end!
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