Dual Extruders and the TAZ

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Orias
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Dual Extruders and the TAZ

Post by Orias » Thu May 23, 2013 8:50 am

We've have been getting a lot of questions in regards to dual extruders and the LulzBot TAZ. We've done some work with a dual extruder setup. Here are some links to some of the work and items. Please keep in mind that it's still somewhat experimental. I would be interested in hearing about your progress, for I hope to do the same!

Image

Dual extruder mount: http://devel.lulzbot.com/TK-0/TestObjec ... ount_2.STL

Reversed Wades: http://devel.lulzbot.com/AO-100/hardwar ... paired.stl

More links:
HIPS testing for support material: http://devel.lulzbot.com/filament/HIPS/
Dual extruders and the AO-101: http://forum.lulzbot.com/viewtopic.php?f=16&t=13
TAZ testing: http://devel.lulzbot.com/TK-0/TestObjects/dual/

1013
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Re: Dual Extruders and the TAZ

Post by 1013 » Thu May 23, 2013 10:33 am

Thanks for starting this.
Dual extruder compatible was one of the main reasons I want the TAZ (and once it is back in stock I shall get one).

But I did get the solid files and have a virtual TAZ, so I can work on the dual extruder. I am not a big fan of having the weight of 2 extruders and hot ends hanging off the front, so I am working on a system with the standard extruder and mount out front, and another (mirrored) extruder mounted off of the back of the X carriage. This should reduce the torquing affect and the x-axis rods, and it also allows for the use of the full x-axis travel.

Y-axis travel is reduced to about 213mm (from 297mm) but the Y axis should be fairly easy to extend. The other issue I see is that an extension will need to be added in order for the x-axis home switch to be tripped and to avoid crashing into the x-axis motor.

couldn't find the extruder modeled up in anything besides STL, so I drew a basic model myself. Here is a picture of my mock-up.
Attachments
Lulzbot TAZ DX-Mod1.jpg
The green squares on the table represent the build area, smaller one is accessible to both extruders

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Re: Dual Extruders and the TAZ

Post by 1013 » Thu May 23, 2013 11:58 am

One big downside of the other extruder on the opposite side of the X axis rods is the large distance between nozzles.

Thinking about just designing a specialty dual extruder that keeps the nozzles as close as possible instead.

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Orias
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Re: Dual Extruders and the TAZ

Post by Orias » Thu May 23, 2013 1:37 pm

You may be able to modify this design to better accommodate 2 Budaschnozzles: http://www.thingiverse.com/thing:34821

1013
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Re: Dual Extruders and the TAZ

Post by 1013 » Thu May 23, 2013 4:51 pm

not bad, but I would really like to use the same hotend and other hardware that is already on the TAZ, to simplify things.

Thanking about just moving the motor a little (up higher) and then puting 2 extruders as close together as the hot-ends allow.

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Re: Dual Extruders and the TAZ

Post by 1013 » Fri May 24, 2013 11:30 am

so the closest the Budeschnozzles can physically be together is 40mm, and this will allow for full axis of the entire build platform if the y axis is extended by only 10mm. 4 simple 5mm shims should allow for that. of course stradleing the x-axis rods is not an option when keeping the nozzles this close.

Here is the latest design. I modified the motor position of the extruders a little so that they could be packed closer together....MAYBE. There still may be some interference with the clamp spring/screw assembly. I also had to rotate them 10 degrees so the motor would not hit the z-axis bearing.

But it does look good so far.
Attachments
Lulzbot TAZ DX-Mod2.jpg
10mm of extended y travel gives full access to the whole build area for both nozzles

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Orias
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Re: Dual Extruders and the TAZ

Post by Orias » Fri May 24, 2013 1:30 pm

That's looking pretty good! I like the way the extruders are nestled against each other.

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Re: Dual Extruders and the TAZ

Post by nateloder » Wed May 29, 2013 7:51 am

This may involve some extra effort, cash, parts and software tweaking but a rotating head could hold numerous extruders without compromising print area. This could be done horizontally with up to 4 nozzles or vertically (like a ferris wheel) to hold even more than that, however doing it vertically may be difficult to keep print area. Precision would be easy to keep and I think it would be faster for switching between materials. You would need a good feed system for the filament to keep it from getting caught up but that should be a relatively simple fix.

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Re: Dual Extruders and the TAZ

Post by 1013 » Wed May 29, 2013 8:24 am

if you add another motor for indexing, you are adding even more weight to the x-carriage. 2 extruders, motors, and hot ends are already pushing the weight limits, not to mention the size constraints. Maybe on a bigger, stiffer machine.


Some other machines use 2 hot ends with one extruder, and just switch between the hot-ends (and filament) by pushing a lever at the extreme ends of the x-axis travel. This would help keep the weight down, but it would have to be very accurate.



PS,
Finally was able to order the TAZ and extra hot end and motor yesterday....so hopefully next week I can get this dual extruder project going.

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Re: Dual Extruders and the TAZ

Post by 1013 » Fri May 31, 2013 9:19 am

Got the extra hot end, stepper motor, hardware, and hobbed bolt in.

are there any instructions or exploded views of how the extruder goes together. I found a video online, but it seems to be for an older version of the extruder.

This helps some: http://www.plastibot.com/wp-content/upl ... truder.pdf

and this too: http://www.thingiverse.com/thing:18379

I guess the main thing I am stumped on is where that plastic printed washer goes? I cant find it in the instructions of the older models?

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