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Greg's Accessible Extruder for MakerFarm Kits

by gmua, published

Greg's Accessible Extruder for MakerFarm Kits by gmua Nov 14, 2013
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Summary

Greg's Hinged Accessible Extruder with Herringbone Gears for 3mm filaments.

Great update to the Greg's Wade Extruder, includes higher precision Herringbone Gears.

This extruder will fit the MakerFarm Prusa 6" i3 and MakerFarm Prusa 8" i3 Kits.

Instructions

I usually print Extruder Parts at 0.2mm Layer height, 40% Infill (which might actually be more than I need), and with 3 Perimeters. I also prefer honeycomb fill pattern, because it looks cool when it's printing, and I suspect that it gives the parts a little more stiffness. (ZennmasterM)

To assemble watch the following video by Colin Farrer
http://www.youtube.com/watch?v=7F-AgSlTCF8

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What is the size of the hexagram in the big gear that holds the hobbed bolt? The end of my bolt dimensions are 14mm small and 15.75mm big. I just printed greg's gears and my bolt it 1mm too big on the small side. Thanks,

Apr 9, 2017 - Modified Apr 9, 2017
gmua - in reply to davidbananas999

David, sorry for the late, late, late reply (I've been out of the 3D printing world for a while) the dimensions of the hexagon are 15.32mm across opposite vertices (I'm sure you figure this out by now) I am posting an screen capture from netfabb - http://imgur.com/a/AjdGZ

What is the size of the hexagram in the big gear that holds the hobbed bolt? The end of my bolt dimensions are 14mm small and 15.75mm big. I just printed greg's gears and my bolt it 1mm too big on the small side. Thanks,

What is the size of the hexagram in the big gear that holds the hobbed bolt? The end of my bolt dimensions are 14mm small and 15.75mm big. I just printed greg's gears and my bolt it 1mm too big on the small side. Thanks,

What is the size of the hexagram in the big gear that holds the hobbed bolt? The end of my bolt dimensions are 14mm small and 15.75mm big. I just printed greg's gears and my bolt it 1mm too big on the small side. Thanks,

What is the size of the hexagram in the big gear that holds the hobbed bolt? The end of my bolt dimensions are 14mm small and 15.75mm big. I just printed greg's gears and my bolt it 1mm too big on the small side. Thanks,

Hi there! Excellent design. I have a Makerfarm Prusa i3v ant these parts look exactly the same. My printer uses 1.75 mmm filament.
Can I use this extruder for it? Thanks!!!

Aug 20, 2014 - Modified Aug 20, 2014
gmua - in reply to Clod

This design is for the MakerFarm Prusa i3, the i3v comes with a slightly modified Extruder Block, the new one comes with two holes to mount a 40mm fan and the MakerFarm Logo on the front side, it is also designed with an extra "mouse ear" to improve adhesion to the heat bed, other than that there's not much difference, you probably could use it if your Hot-End is a J-Head because the fan is not that necessary.

For printing the 3D printer parts, should I use PLA or ABS for the parts?

The set of parts that I got from MakerFarm are printed using PLA, but Google it, I think is a matter of preference, PLA is harder, but ABS resists higher temperatures. Collin from MakerFarm recommends to lower the current on the extruder stepper to avoid warping, my guess is that ABS resists warping better than PLA when the stepper motor gets hot.

For some reason I get a lot of full layers in this :/
edit: on the large gear that is.

In Slic3r 1.0.0 RC1, I'm using the following parameters:
layer_height = 0.25
perimeters = 3
top_solid_layers = 3
bottom_solid_layers = 3
fill_density = 0.4
After slicing the Large Gear, I get 40 layers and in 28 of them I have at least 60% visible honeycomb pattern, hope this helps.

The large gear is a little loose on my hobbed bolt. Would you be able to provide the source file that the stl's were created from?

Dec 4, 2013 - Modified Apr 10, 2017
gmua - in reply to unlucky1

When I uploaded this extruder I only had the STL file from MakerFarm, but after a little searching I found out that the two gears are from KR2 Hugo design and the source files are on GitHub: https://github.com/kr2/Hugo they are in SCAD format so it's not that difficult to modify, enjoy.

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