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Add a name, a logo or a picture to a 3D model you already have: cut it into the surface, or raise it out. Load the STL, type the text in any font or add high-contrast artwork, pick the face it goes on, then drag it into place and set the width, rotation and depth.
The depth follows the surface, so 0.8 mm deep is 0.8 mm everywhere, even on a cylinder, a sphere or a scanned model. Only the face you pick is touched. Your original model is never uploaded: it all happens in your browser.
About 0.6 to 1 mm reads well. Deeper is rarely better, and fine lettering needs a high Detail setting to come out cleanly.
Engraved text is easier to read on most prints, because the recess casts a shadow. Embossing is better when the surface will be sanded or painted.
Yes. The cut is made in a shell that follows the model, so the depth stays even on curved faces.
The whole model is rebuilt at the Detail resolution, so sharp edges soften very slightly and the file grows. For flat-sided parts where exact edges matter, engrave in the 3D Designer instead.