1.About OBJ files
OBJ files are 3D model files that can include texture and surface detail information.
When performing 3D inner glass engraving, using OBJ files can produce richer details compared to STL files.
2.How to use OBJ files for engraving
Important: Turn off your computer’s sleep function before starting the engraving process.
Step 1: Check your OBJ file folder, make sure the folder contains all necessary files
(the model file (obj) and its associated material/texture files (.mtl, image textures, etc.).
Image 1: Example of a complete and properly structured OBJ file folder
Step 2: Open ComMarker Studio and import the OBJ file directly from its folder.
Note: If you can’t see the OBJ file as shown in Image 2, type in the OBJ file’s full name in file name section and click Open.
Image 2: Correct file import path
Step 3: After import, confirm that the software has successfully detected and applied the textures.
| Image 3-1: Correct texture imported result | Image 3-2: Incorrect texture imported result |
Step 4: Enter the dimensions of your crystal block in the software.
Image 4: Import area for crystal block size
Step 5: Scale the model to fit appropriately within the crystal dimensions.
Image 5: Adjust area for model size
Step 6: Rotate and position the model so that the main viewing side (e.g., a person’s face) faces the XY plane.
This ensures the key details are presented most clearly during engraving.
Image 6: Suggested model position and adjust area
Step 7: Import the setting
Image 7: Suggested setting
Step 8: Make sure the red dot is on the engraving bed, then click Focus
Image 8: Focus complete
Step 9: Place the crystal cube on the engraving bed.
Click Preview and use the frame preview tool to verify alignment. Adjust the position if necessary.
Image 9: Performing preview
Step 10: Close the safety door and click Start to begin engraving.
Image 10: Laser engraving in process
Step 11: Wait for the laser to finish, and check the result
Note: If you see missing dots on the engraved item, try adding the greyscale 0 marking time, 5 could be a start.
Image 11: Adjust engraving time for greyscale
Appendix 1: Common Mistakes and What Not to Do
Mistake 1: Using a model with low contrast
Solution: Take a picture of your model and convert it into black and white. Then check if the texture and brightness levels look clear for engraving.
Tips: Most smartphones can convert photos to B&W.
Image 12-1: Model contrast check Image 12-2: Low-contrast model
Mistake 2: Using a model that has hollow walls or internal cavities.
For inner glass engraving, having internal gaps or double surfaces causes ghosting or unwanted shadows in the final result.
Image 13: Model with walls and its flawed result
Mistake 3: Using a model with a dirty or noisy surface
Many AI-generated models include small bumps, artifacts, or speckles.
If you use these without cleaning up, the engraving machine treats them as real features, causing rough or dusty-looking engravings.
Image 14: Model with noisy surface
Mistake 4: Using models with multiple overlapping shells
Models with thick outer shells (like a spacesuit helmet) create a white background that blends with transparent or semi-transparent face parts. This blending causes facial details to become indistinguishable when viewed from the front.
If you have to use a shell, make the shell color as dark as possible.
Image 15: Model with shells and its problematic result
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