QU-BD Extruder Modifications
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Published on December 21, 2012
Description
My QU-BD extruder was stopping a lot so I made some modifications. The primary problem was the way they push the filament against the drive gear with a set screw. I switched to a spring loaded idler pulley. This will work with the stock QU-BD drive gear, but I switched to an MK7 style drive gear. The extruder is super reliable now.
There are two versions of the parts to allow you run the filament through the right side or left side. You need a 4mm I.D. x 13mm O.D x 5mm thk bearing (624), a button head 4mm x 10 screw, a 4mm washer and a spring. I used a 3/8" x 1-1/8" x 0.047 spring from a Home Depot assortment pack. The other parts are available a lot of places, but I bought mine at McMaster Carr.
It all fits within the width of the motor, so two can be run side by side.
I have a wiki page of all the things I did to tune up my QU-BD extruder here... buildlog.net/wiki/doku.php?id=ord_bot:qu-bd_extruder_improvements
There are two versions of the parts to allow you run the filament through the right side or left side. You need a 4mm I.D. x 13mm O.D x 5mm thk bearing (624), a button head 4mm x 10 screw, a 4mm washer and a spring. I used a 3/8" x 1-1/8" x 0.047 spring from a Home Depot assortment pack. The other parts are available a lot of places, but I bought mine at McMaster Carr.
It all fits within the width of the motor, so two can be run side by side.
I have a wiki page of all the things I did to tune up my QU-BD extruder here... buildlog.net/wiki/doku.php?id=ord_bot:qu-bd_extruder_improvements
Instructions
1. Select the version you need depending on what side of the shaft you run your filament through.
2. Print the parts.
3. Use a 3mm drill to clean out the holes.
4. Assembly the lever, bearing, washer and screw. You should be able to "self tap" the screw into the lever.
5. Assemble everything on the extruder except the lever. There is a little bump on the spring block that points towards the motor. This prevents it from rotating.
6. Install the lever with the spring. Hold the spring compressed while installing the screw that goes through the fan, heatsink and lever into the motor. Make sure you don't over-tighten the screw and lock the lever in place.
Inspiration came from this thing thingiverse.com/thing:15718
2. Print the parts.
3. Use a 3mm drill to clean out the holes.
4. Assembly the lever, bearing, washer and screw. You should be able to "self tap" the screw into the lever.
5. Assemble everything on the extruder except the lever. There is a little bump on the spring block that points towards the motor. This prevents it from rotating.
6. Install the lever with the spring. Hold the spring compressed while installing the screw that goes through the fan, heatsink and lever into the motor. Make sure you don't over-tighten the screw and lock the lever in place.
Inspiration came from this thing thingiverse.com/thing:15718
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3DprintingMADness
on
January 8, 2013
said:
Would you be willing to modify this to work with a nema 14 motor. I know it probably won't work but I would like to give it a try.
tmac
on
December 29, 2012
said:
Does anyone have a photo of an ord bot with the ad-bd
Dual extruder mounted? I bought the complete kit that came with both. I just need a visual to get an idea how things are oriented.
I love the mod Bart!
idolcrasher
on
December 28, 2012
said:
Looks really nifty. May I ask what carriage you are using to carry your QU-BD extruders?
I have 3 QU-BD extruders and I am not sure how to best use them in a project.
License
QU-BD Extruder Modifications by bdring is licensed under the Attribution - Share Alike - Creative Commons license.
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Two months ago, I designed a similar mechanical structure of the extrusion head.Feels it has a few flaws:
first, the extrusion force is not enough
second,the extruded filaments don't straight enough