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