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Geeetech MK8 dual extruder plate for my Quick Fit Carriage

by lukie80, published

Geeetech MK8 dual extruder plate for my Quick Fit Carriage by lukie80 Nov 5, 2016
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Summary

A mounting plate for the Geeetech MK8 dual extruder made for my Quick Fit Carriage (http://www.thingiverse.com/thing:1670305). The fans and heat sinks have to be removed to fit the plate (they reduce Y-building volume by ~29mm and increase weight and torque of the carriage). Alternative cooling of the throat and the two motors is achieved by a air-duct system powered by a 50mm blower. On each side mounting holes for M3 screws and nuts are present to allow for fixation of bed-level sensors. These holes have a separation of 26mm. I made the blower-attachment removable. I'll add a 40mm fan version later.

Used dimension of the mounting bracket: 86.0mm x 10mm x 15.5mm.

Because I do not have a dual extruder, I cannot check if everything is OK. There are no CAD-data-sheets available for the extruder.

Thanks to Tombhunter for manifold and valuable bug-fixing input.

Print Settings


Notes:

A version with and without manually designed support is provided. Please select proper printing orientation: The flat side is down. The manually designed supports indicate proper printing orientation.

Post-Printing

  • Remove the various optimized support structures.
  • Use M3 nuts for fixation of custom attachments.
  • Use M4 screws for fixation of the extruder.

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Really enjoying the carriage design. Printing this plate now and it looks like you may have reversed the recesses for the nuts on the funnel piece. The design as it is now has the nuts going on the outside of the funnel which doesn't make sense to me unless the fan is intended to be mounted inside the funnel which I don't see how that'd be possible, hehe. =P

Kudos all around on these designs, btw. I was on the verge of building a separate printer because I wanted to try my hand at milling some circuit boards without having any down time from disassembling my X axis. Now it's gonna be as easy as pulling a lever and swapping plates!

Okay, I've made and tested this, and the mechanics and layout are great. The cooling seems to work fine. The only issue is the weight. The two extruder motors put a lot of downward force against the plate mount, and it causes the mount to sag slightly, a few degrees. It's visually noticable, and I'm not concerned about it now, I'm more concerned about over time. And heat deformation of the mount and the sag will get worse. I think what I'm going to do is shift the dual extruder over to a Bowden style feed system with the extruders mounted on top of the Prusa i3 Frame.

Another thing I might try is a modification of this Sag Straigtener: http://www.thingiverse.com/thing:1064637

Geeetech Dual Extruder Sagging Straightener
by osem

I'm printing this out now. I've got the Geeetech Dual MK8 extruders. I'm just not sure how/where the funnel attaches?

I am a little concerned by how the design pushes the air through and over the top of the hot end and then up to the extruder. I'm a little worried about how much head that might push up to the plastic of the Quick change mount and the plate itself. I guess I'll find out once I test it.

Hello you have made a very interressante project I would like to achieve is my printer already has twice extruder a compatible direct me you would know the fan support .. thanks

Hi. Thanks. I'm not sure what you mean with fan support. If you mean the 40mm fans of the dual extruder: They have to be removed to be able to mount the extruder.

I need a support for a fan that cools the materials for two extruders.

I've added a dual-funnel for 40mm fans which come with the dual extruder. I suggest printing the funnel with manually designed support. You can glue M3 nuts into the appropriate holes to be able to fixate the fans.

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