ideal extruder

[Marcus Wolschon]

I'm currently designing a new extruder that combines the best design-
details that have emerged since Wade's.

* It will gear down the stepper like Wade's does.
* Use herringbone-gears to reduce backlash and noise like some others
I found.
* Use a spring-loaded lever to make filament changing and adjustments
of pressure easy and keep the pressure constant as the nut does not
loosen after a while.

my own ideas:
* integrate a filament cleaning-sponge into the extruder to keep dust
and dirt out.
* integrate the mounting-holes for the stepper-fan into the extruder-
design.
* add an optional rotary encoder to detect failures and pause the
print for later resuming if no filament is actually transported
(grinding, blocked nozzle or simple no filament left)
* keep the center of gravity down and mount the toolhead at 3 points
to keep it stable when the ToM is transported and reduce any possible
shaking/backlash in XY.
* be compatible with multiple existing hot-ends (I want to use it on
the ToM with Makerbot -hotends and on the Repman with pre-fabricated
and self-assembled BitsFromBytes hotends.)
* allow 2 mirrored extruders to be mounted side by side on the ToM for
multi-color/material prints
(no need for this on the RepMan as that natively supports up to 3
toolheads)

http://marcuswolschon.blogspot.com/2011/07/extruder-design.html

Does anyone have additional ideas, I could integrate?
Any problems I may not have thought through yet?
Feedback?
(The rendering is only a very, very early draft. It will change.
Especially the rotary-encoder is not included yet.)


I'm posting this on the Makerbot Operators group, the BfB-forum and
the RepRap-forum as all 3 groups are involved and may have ideas about
making this as good as I can make it.

Marcus

[Joheinz]

I can't look at the rendering currently, but an additional feature would be to have open access to the Gear to clean stripped debris. Markus

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[Marcus Wolschon]

The gear is on the outside and completely accessible.

Btw, it's Marcus, not Markus. ;)

Marcus

[Andrew Plumb]

Yes, your name is Marcus. His name is Markus, he just doesn't have it in his e-mail address like we do. ;)

Andrew 

Sent from my iPhone

[Marcus Wolschon]

On Mon, Jul 4, 2011 at 13:52, Andrew Plumb <and...@plumb.org> wrote:

Yes, your name is Marcus. His name is Markus, he just doesn't have it in his e-mail address like we do. ;)

Sorry, that was confusing. ;)
"Heinz" is a normal first name here.

[Andrew Plumb]

Just to add to the confusion, I don't think his name is Jo or Heinz either.

Markus will have to fill us in on the details of how "joheinz" fits into all this. :)

Andrew

[Joheinz]

Oh, it is a pretty long story, but essentially it is a login name which is always available and includes some family folklore and my second name Johannes and the Heinz part is just in there for the sake of it.

Markus

Am 04.07.2011 14:01 schrieb "Andrew Plumb" <and...@plumb.org>:

On 2011-07-04, at 7:55, Marcus Wolschon <Mar...@Wolschon.biz> wrote:
>

> On Mon, Jul 4, 2011 at 13:5...

Just to add to the confusion, I don't think his name is Jo or Heinz either.

Markus will have to fill us in on the details of how "joheinz" fits into all this. :)

Andrew

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[James McCracken]

Back to the topic at hand:

RELEASE THIS WITH MULTIPLE MOUNTS!!!

I should be able to print this and choose one more thing to print, to
mount it on a Mk4, Mk5/6, printed dinos, reprap, and any other
printers out there...

Oh why didn't we standardize hot end to extruder mounting a couple
years ago?!?!? lolz

[James McCracken]

I just rethought this and it gets even more complicated.

You've got the mounting holes to put it in the bot, and the mounts to
attach a hot end to it. If it doesn't support someone's favorite
mount or nozzle or whatever, that person won't be able to use it...

[Marcus Wolschon]

Guess why we have a dead thread about defining a common toolhead-mount in the RepRap -forum since ages?
RepMan has a cool mechanical mount, Makerbot is completely lacking an electrical plug, MiniMendel has a bowden extruder,

I don't know Mendel/Darwin/Huxley. I never used them.
Are there technical drawings of their mount? (I don't care about the electrical part yet.)

Marcus

[James McCracken]

I'm not a rep-rapper either, so I don't know...

[Joe Kerman]

The primary reprap extruder (the "gregs wades accessable") is modular. You choose a mounting system when generating the STL file from openscad, new mounting systems are modular blocks of code. It is very easy to add new mounts.

its pretty cool! http://www.thingiverse.com/thing:8252  will require at least configuration.scad from https://github.com/prusajr/PrusaMendel

There is a lot of documentation in the reprap community about many types of extruders that many engineers have put a lot of time into developing and testing.  I would suggest tapping that community for development advice as well.

[Joe Kerman]

By which I mean, the mounting system where the hotend attaches to the extruder.  The extruder mount itself is, as far as I know, standard in the reprap community.  Its only makerbot that has the strange one :)

[Marcus Wolschon]

On Tue, Jul 5, 2011 at 18:52, Joe Kerman <jke...@gmail.com> wrote:

By which I mean, the mounting system where the hotend attaches to the extruder.  The extruder mount itself is, as far as I know, standard in the reprap community.  Its only makerbot that has the strange one :)

So it is  the same circular quick release one as with RepRap "Darwin" and thus RepMan?