Apart from this trick, there's no way with any current slicer to
define areas for solid fill and other areas for sparse fill.

Have you tried printing with different in-fill?  I used thicker walls and
50% infill and the resulting part was quite strong.

- G.

The only way I know is by making tiny (try 0.1-0.2 mm) vertical holes in the
area of the model where you'd like it to be filled in.

Space the holes based on your extrusion width and the number of perimeter
shells, then slice and examine the toolpath to see if the desired area is
filled well enough.

From: thingiverse@googlegroups.com [mailto:thingiverse@googlegroups.com] On
Behalf Of Dolf Veenvliet
Sent: Saturday, September 15, 2012 6:03 AM
To: thingiverse@googlegroups.com
Subject: [thingiverse] Can I make my prints stronger?

Hi... Ok, so I am doing fine with my parts so far, but I just now created
one that needs to really be quite a bit stronger than it is. I blame the
fact that it's hollow in parts where I think it should be solid.

Is there a way to define where the model is printed hollow (with the
honeycomb), and where it should be solid all the way through?

This is the piece I'm working on: http://www.thingiverse.com/thing:30484

Thanks!

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Mark

On 18/09/2012 11:04 AM, Denis Bakin wrote:

Something that just occurred to me that might be worth trying is to hollow out the portion that you want to strengthen, being sure to leave a bridge across the top. Then, when you slice it, turn on support structures and make them extremely dense so that they fill the hollow area. Of course, the model design would have to avoid having supports anywhere else.

Something similar can be done if you have 2 extruders. Separate the model
into sparse filled part and dense filled part, then slice them separately
with different infill ratio, and then mix the gcode like it is done for the
multi-color objects. Seems like a way more complex than just making the tiny
holes though.

Alternatively, it seems like that particular object can be easily designed
for printing with 100% infill by adding a hollow area inside the top of the
handle where there is no need for the structural strength.

From: thingiverse@googlegroups.com [mailto:thingiverse@googlegroups.com] On
Behalf Of whosawhatsis
Sent: Tuesday, September 18, 2012 1:19 PM
To: thingiverse@googlegroups.com
Subject: Re: [thingiverse] Can I make my prints stronger?

Something that just occurred to me that might be worth trying is to hollow
out the portion that you want to strengthen, being sure to leave a bridge
across the top. Then, when you slice it, turn on support structures and make
them extremely dense so that they fill the hollow area. Of course, the model
design would have to avoid having supports anywhere else.

for a simple pillar region I would think (in my ignorance?) it would be

straightforward. I don't have a g-code driven printer but for my mill I

periodically use either a shell script or Excel (via fill-down and the

concatenate formula) to churn out some repetitive space-filling gcode

Mark

On 18/09/2012 11:04 AM, Denis Bakin wrote:

The only way I know is by making tiny (try 0.1-0.2 mm) vertical holes in

the area of the model where you'd like it to be filled in.

Space the holes based on your extrusion width and the number of

perimeter shells, then slice and examine the toolpath to see if the

desired area is filled well enough.

*From:*thingiverse@googlegroups.com

[mailto:thingiverse@googlegroups.com] *On Behalf Of *Dolf Veenvliet

*Sent:* Saturday, September 15, 2012 6:03 AM

*To:* thingiverse@googlegroups.com

*Subject:* [thingiverse] Can I make my prints stronger?

Hi... Ok, so I am doing fine with my parts so far, but I just now

created one that needs to really be quite a bit stronger than it is. I

blame the fact that it's hollow in parts where I think it should be solid.

Is there a way to define where the model is printed hollow (with the

honeycomb), and where it should be solid all the way through?

This is the piece I'm working on: http://www.thingiverse.com/thing:30484

Thanks!

--

Go visit thingiverse at http://thingiverse.com and stay tuned to the

blog at http://blog.thingiverse.com.

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<mailto:thingiverse@googlegroups.com>

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Thanks for the responses everyone! Some really good tips in there.

Turns out that, in the Replicator-G software you can set it (in-fill
setting) so that it's printed completely solid, which will work great in
this case!

Dual extruders not for different colors nor water soluble support but for
different infill ratios in different parts of the same object! Genius! How
come I did not think of this?! This would come in very handy for my printed
bicycle project!

It is not really necessary to have 2 extruders for that.

It's just the application of the dual color printing technique for a
slightly different purpose.

Using dual extruders it might be possible to make something like an ABS
thing with a PLA frame inside.

The combination of the materials with different properties in one object
might give surprising results (just a thought).

From: thingiverse@googlegroups.com [mailto:thingiverse@googlegroups.com] On
Behalf Of Elbot
Sent: Thursday, October 11, 2012 12:56 AM
To: thingiverse@googlegroups.com
Subject: Re: [thingiverse] Can I make my prints stronger?

Dual extruders not for different colors nor water soluble support but for
different infill ratios in different parts of the same object! Genius! How
come I did not think of this?! This would come in very handy for my printed
bicycle project!

--
Go visit thingiverse at http://thingiverse.com and stay tuned to the blog at
http://blog.thingiverse.com.

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http://objet.com/3d-printing-materials/digital-materials

it might be possible to get something similar by feeding multiple
materials (why stop at 2?) through the same extruder nozzle (I just saw
someone doing this for colours the other day, but it'd work the same way
for tuning other properties as well) - then in your model file you
specify the physical properties per vertex and your printer makes it up
on the fly by mixing 2 parts A, 1 part B and 3 parts C etc

the trick would be selecting materials that will bond to one another -
probably best to choose a set of midified polymers with the same root
structure

Mark

On 10/11/2012 10:53 AM, Denis Bakin wrote:

Reminds me of a paper I just saw from utexas where a single build platform
was shuttled back and forth between two printers - one did the high
resolution shell in one color, and the other did the thick, low resolution
infill in another color:
http://utwired.engr.utexas.edu/lff/symposium/proceedingsArchive/pubs/...