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3D printer
Posted: 24 April 2017 10:33 PM   [ Ignore ]  
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Joined  2013-07-16

hello
i have big problem its first time i do 3d modeling knife with name for printer its simple model
when i send it to company to do 3d print tell me there problem in modeling give error
the error is because to 3d printing the file must be manifold
the comapny send me notes but i can do anything :( :( i must send it tomorrow

http://3dprintingninja.blogspot.com.eg/2014/11/boolean-trouble.html
http://www.instructables.com/id/Non-manifolds-Your-Worst-3D-Printing-Nightmare/

the file project : https://www.dropbox.com/s/0ji24fj2zoax10q/knife.c4d?dl=0

please help me its will make me in big problem with my clients :(
thank you

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Posted: 25 April 2017 12:54 AM   [ Ignore ]   [ # 1 ]  
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Hi Ahmedmostafa,

I have no idea what kind of printer they use. So, my data might be off in some points.

Let me share my thoughts, but with (again) some cautions and no guarantees.

First of all, I’m not aware of any printer that can print that small. You typed in 100 in scale, but I’m not certain if that is received on their end. I just had a piece back from a printer that came in as inch instead of cm. Even the file had an order describtion in cm. One can’t communicate enough.
Mesh> Commands> Reset Scale * >>Compensate Points.
Typically a printer has a specific needs for a format, usually not a native C4D, more something like e.g., STL (which you can have from the C4D Export Menu.)

Second, and printer, except printer that print from a fluid base, layers a model. In other words, it starts from a “floor” or ground plane. It can’t start in the air. It needs something that holds it, and that “support construction will be removed later on.

To the best of my knowledge, if a model has a certain “volume” locationally, the inside is created more detailed, like rips. It is AFAIK not alone to use less material, it is also a question of heat, but I might be wrong here, as I said, all I have is a C4D file as information. (In the scene file below I have not introduces a pattern, as I do not know what process is used.

Any model must (!) be “water-tight” (“Optimize” helps here a lot), can’t have shared edges with more than two polygons on it and should never ever have unconnected edges (as in they look connected but if one pulls a single polygon away, the gap becomes visible.)

I’m not certain how tolerant the software of the printer is about Normals. They always should look into the same direction—surface wise.

Each model has a certain resolution, based on the layer thickness that the printer uses. Layer-direction is as well the weaker part. Some details might not show up.

The Boole might not work here,though it has limitations on “organic” to “round edges”. I would (tested with some letters) boole it and leave the Letters out. The edge that is created needs then some clean up with the Weld tool, so many long Triangles!

This cleaner edge can be then extruded to the inside and the “hole” filled with a polygon. I left an Edge selection in the file so you can see that step. This was more an workaround based on the Boole, but much more refined e.g., in terms of point /edge count.

The whole model has good starting points, but I would have modeled a little bit more with the Letters in mind, so each letter would have a polygon or a few on its own and not cut through the few original edges.

The attached model is done in the way described so far, kind off - see remarks if not. This is not a model that I would directly send to a print house (but certainly a good base to get some input from them, as I would start with the “Non Sub Divided” model on a more detailed level, as mentioned.

Let me add: from time to time I used the command M~V to spin an Edge. To avoid long triangles. I checked the normals and they are fine, but on some “edges, there are nests with small polygons that has some concerns. See AttributeManager>Mode> Modeling> Check. You are certainly familiar with it.

I have left some steps in the file, they are more based on showing the way, not meant as a “this is now final work. It took me a while. To make it pristine I would start over, completely. I hope you do.
Please get in contact with the print-house and ask what they need, without that knowledge you might run into trouble.

All the best

https://www.amazon.com/clouddrive/share/oSNB6jgF9RDSGcagIEMKumc992DnS9OWKLqVzYKM2nC?ref_=cd_ph_share_link_copy

With the little (zero) information I got what kind of printer is used, here a STL model in cm for a test run. Y axis is vertical, often the Z axis for those printer is vertical, but that is an easy fix.
https://www.amazon.com/clouddrive/share/gjVH42iDWROE6d72Xrye3wN14APHmc6ykFMwbB7stau?ref_=cd_ph_share_link_copy

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004
Maxon Master Trainer, VES, DCS

Photography For C4D Artists: 200 Free Tutorials.
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Posted: 25 April 2017 02:57 AM   [ Ignore ]   [ # 2 ]  
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Ahmedmostafa, one more:

One of the ways you can start those things is to create the “core” shape. In this case the most problematic is the BUKAN name inside the blade. Start with a flat object and a flat type-object, or as shown in the example.The Circle is more to test how the edges follow this bend action, It could be a a square, and later use the Symmetry again, after deleting unwanted parts.

If all is flat, Boole works much nicer. When this is done, the model can be bend or brought into shape with many deformers. The Spline Rail or the Spline Deformer are certainly to name, as well as the Surface deformer (which allows simple surface manipulations to transfer to more complex objects) and so on.

The example below might be very simple, but it should encourage you to explore the problem first and then start.

If a cube with the BUKAN type is done and already in a nice mesh, you can go from there. The letters by itself will not Subdivide (Subdivision Surface), so get to the right density at that state. You can extrude from there and scale the latest front of backside, it the tip of the knife is front and the handle backside.

https://www.amazon.com/clouddrive/share/61v7Odx6hM1xawVjXcEJ13e8dvEAw6eqL7Desk4Vzcg?ref_=cd_ph_share_link_copy

A different way, but similar in its approach:
https://www.amazon.com/clouddrive/share/rDDurIGN1NRZnx5gRDjSYMB2L886y0n5oqAeA0RsDg8?ref_=cd_ph_share_link_copy
Instead of a small Extrude, a CMD-Drag works, just use the axis of where to go.

Another option, it the model is done could be with the Line Cut and a Spline:
https://help.maxon.net/#TOOLKNIFELINE
Image #3

I hope that jump starts your work.

My best wishes

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004
Maxon Master Trainer, VES, DCS

Photography For C4D Artists: 200 Free Tutorials.
https://www.youtube.com/user/DrSassiLA/playlists

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