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yyh1002

Third Color for Dual Extrusion Printers Testing

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I did some testing on creating the third color with dual extruder, inspired by Tim Kuipers’ greyscale printing research and the effect on prime tower (https://ultimaker.com/en/blog/49783-3d-hatching-grayscale-printing-on-the-ultimaker-3).

Interlacing two colors can create third color on vertical surface quite consistantly as long as the two nozzles are properly calibrated. 

IMG_3394.thumb.JPG.660dd312df0dec0514f5a2b6f67da192.JPG

 

I then tested the idea with an astronaut model by BZH1 meant for 3-4 color (https://www.thingiverse.com/thing:2609610). I prepared the model with Rhino, manually cut the third color into slices, and imported into Cura together with the other two colors. Surprisingly, Cura was able to hollow out the third color instead of printing it as a solid piece. 

698389480_3DPhil3Color.thumb.png.df3d546e841d3be6ab986a1ae73b5c7b.png

Infill.thumb.png.ae8944d41a300a730d133905ac3f486d.png

 

The print came out has a nice tone thanks to the additional color. It is showing mixing inconsistancy possibly because of heated bed shape change or one of the magnets on my mark2 coming loose during the print. 

DSC08287.thumb.jpg.d2301e821173803513de8d52fb21f2c4.jpg

DSC08286_c.thumb.jpg.3c6dd06d166806cc3bcb1f10e84a6bfb.jpg

 

It would be nice if CURA can add a third color choice and slice the part with half tone treatment as an experimental feature. 

 

Edited by yyh1002
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44 minutes ago, ahoeben said:

Nice result! Note that the research you reference is actually by Tim Kuipers (@bagel-orb). Matt just wrote the blog article on it.

Oops, my appologies to Tim. It’s been too long since I read the article so I just jumped in and refered to the author. Thanks for correcting me. 

 

34 minutes ago, pbackx said:

This is a great result.

 

How did you manually slice that third color? Did you use the CuraEngine branch by Tim or some other trick?

 

I didn’t try the CuraEngine branch by Tim. I literally cut the objects in disks in modeling software. 

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You don't need to cut the model into layers, Cura already automatically does that for you by default!

Just load the part where you want to alternate color twice and set one instance to the one nozzle and the other instance to the other nozzle.

Make sure Remove Mesh Intersection and Alternate Mesh Removal are both enabled and also verify that Top Layers and Bottom Layers are even numbers to prevent them becoming solid. Verify these settings for both nozzles.

Here's what the layer view looks like for a model similar to https://www.thingiverse.com/thing:1421443

The eyes are in both colors.

image.thumb.png.e87a718b28accadbe5df4f777449b13b.png

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48 minutes ago, bagel-orb said:

You don't need to cut the model into layers, Cura already automatically does that for you by default!

Just load the part where you want to alternate color twice and set one instance to the one nozzle and the other instance to the other nozzle.

Make sure Remove Mesh Intersection and Alternate Mesh Removal are both enabled and also verify that Top Layers and Bottom Layers are even numbers to prevent them becoming solid. Verify these settings for both nozzles.

Here's what the layer view looks like for a model similar to https://www.thingiverse.com/thing:1421443

The eyes are in both colors.

image.thumb.png.e87a718b28accadbe5df4f777449b13b.png

I tried this earlier. It works most of the time but the interlace is not as consistant as manual cut. Sometime the part shows same color for a few millimeters. It would be awesome if the feature is more reliable. 

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24 minutes ago, bagel-orb said:

I cannot reproduce your problem in Cura 3.4.1.
I tried making the whole body in both colors and there were no layers where the color wasn't swapped to the other color.

If it keeps persisting in your model you can try setting the Horizontal Expansion of one of the extruders to -0.01mm.

Thanks for clarifying this. In this case I think it was because I export the overlapping geometry together with each color and the mesh possibly turned out slightly different. I tried export the overlap geometry by itself and the interlacing seem to work just fine. 

Edited by yyh1002

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Hmm. It should work better when you have the gray regions as part of the 1 mesh for white and the 1 mesh for black. If you keep just 2 meshes there will be less boundaries on the inside of the mesh.

If you use my method to model the gray region as a separate mesh you will get wall lines between the gray and the white or black regions. That's a waste of material.

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I tried export just two meshes again. I needed to transfer the model into mesh before export to make sure the overlapping part has the exact same mesh so the auto generated interlacing works perfect.

I printed another one at 70% scale and 0.1mm layer, with fuzzy skin of 0.1 thickness and 0.2 distance. The skin finish is almost injection mould quality. The randomness of fuzzy skin makes the color mixing a bit messy. Is there a way to make fuzzy skin more regular with constant zigzags shifting every layer?

DSC08298.thumb.jpg.bdea3bb49effa1f94be9870fcc618bfd.jpg

DSC08299.thumb.jpg.da797c66fed418d12e2099e3405b3562.jpg

DSC08300.thumb.jpg.2a314da123a51065e8a79c7dfd8b3cf4.jpg

DSC08295.thumb.jpg.a73be882da31d5f07a94ac73c6925401.jpg

Edited by yyh1002

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