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Novel Colour Concept

Posted by VikOlliver 
Novel Colour Concept
October 25, 2011 03:23PM
It occurred to me that we could colour the plastic after a layer has been deposited.

Either use a "Unicorn"-type pen holder to colour the surface/edges of an object, or a whole inkjet head to spray on a layer of colour from above.

Add another translucent layer of plastic and re-colour. Rinse, repeat.

Any takers?

Vik :v)
VDX
Re: Novel Colour Concept
October 25, 2011 03:50PM
Hi Vik,

for the rough surface of a layer an ink-jet head will be better than a sharpie, even when it's supported by a spring.

Points to a two-head printer ...


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: Novel Colour Concept
October 25, 2011 05:07PM
Couldn't you infuse the color directly into the liquid plastic just as it's dispensed?
That way, the color would be spread relatively uniform in each 'blob'.

Alternatively, in what way do the colors of different fibers mix? (Probably additive, but we're definately not geting something as simple as RGB or CMYK).
Could we get away with building a three/four color extruder that controls the color being dispensed by the proportion of different filaments?

If mixing colors is not an option, we might at least be able to add more white for lighter colors, allowing us to print in shades.
In fact, this might be a good option to start with, expanding to color mixing later.

Edit:
Just found this on thingiverse: [www.thingiverse.com]

Edited 1 time(s). Last edit at 10/25/2011 05:20PM by SarahMiller.
Re: Novel Colour Concept
October 25, 2011 08:49PM
Mixing viscous liquids is tricky, hence the idea of only putting the colour where it is needed.

Might have to play with unicorn pens. In theory you could see what this looks like by following your printout around with a sharpie smiling smiley But it allows a relatively simplistic build, which I like.

Vik :v)
VDX
Re: Novel Colour Concept
October 26, 2011 03:19AM
... i'm thinking about powder-sintering with a diode-laser and different materials.

With changing the material or colour per layer or even inbetween a single layer (by exhausting the previous powder and filling the actual layer with the new powder) you can print all imaginable combinations of mixed materials (plastics, ceramics, metal, wood/lignin, ...) and/or colours.

So my aim is a powder bed fitting to my repstrap and changing the firmware for handling the layer-changing ...


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: Novel Colour Concept
October 26, 2011 08:24AM
Regarding the inkjet cartridge solution, here's something that could help : [www.kickstarter.com]

I have one coming my way, and sooner or later it will end up on a reprap of some sort.
Re: Novel Colour Concept
November 04, 2011 05:06AM
How about a multi headed extruding tip that can feed 3 different colored filaments(blue,green,red) through the same hole at once ?
Tricky to build I know, but you could have each filaments extruding at alternate speeds to create different colors.
I guess it would also be a huge task to change all the software to run it also.

Ignore this post if to far fetched >.>
Re: Novel Colour Concept
November 17, 2011 04:19PM
Spenc Wrote:
-------------------------------------------------------
> How about a multi headed extruding tip that can
> feed 3 different colored
> filaments(blue,green,red) through the same hole at
> once ?
> Tricky to build I know, but you could have each
> filaments extruding at alternate speeds to create
> different colors.
> I guess it would also be a huge task to change all
> the software to run it also.
>
> Ignore this post if to far fetched >.>

I'd hate to have to clean such a beast ;-P
Re: Novel Colour Concept
November 17, 2011 07:56PM
I had a few 3am pondering sessions on this topic recently..

Pre-print.. CMYK pigments (powder and a custom binder? Or acrylic?) feed into as many plastic syringes as you need colors in your print.. let's say four.

During print, one peristalic pump drives a hose from each syringe and releases the droplets of color over a compressed air source. Use solenoids or a cam to unpinch/select the color you want. I think you would want to print a compressed air nozzle that shielded/directed the spray appropriately. Maybe a donut shape that surrounds the extruded plastic? Ideally you would mix the PLA and the color pre-extrusion in a screw-type mixing drive.. CMYK powders and PLA granules.. but that sounds incredibly messy and I believe that high temp is going to be an issue for many pigments.
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