Engraving a logo into a 3D print without losing the detail

You have the company logo as a PNG, a flat face on the part, and a plan. What comes off the printer is a grey smudge in roughly the right shape. The logo is fine. The problem is that a logo is drawn for a screen, where a line can be any width at all, and a printer cannot draw a line thinner than its nozzle.

Depth, face choice and batch numbering are covered in the serial numbers guide, and the same rules hold here: cut in rather than raise, 0.8–1.2 mm deep, on a flat non-mating face with enough wall behind it. This guide is only about the artwork.

A logo is not text

Text survives being small because a typeface designer already solved the problem: even stroke weights, open counters, generous spacing. A logo is usually drawn once, large, by someone who was never thinking about 0.4 mm. Four things behave differently from letters:

• Hairline strokes. Fashionable in a wordmark, invisible in plastic. An outline-only version of a mark is the worst case, because every part of it is a hairline.
• Gradients and shadows. An engraving has exactly one depth, so every pixel is either cut or not cut. The artwork is a one-bit image whether you prepared it that way or not.
• Enclosed counters. The hole in an a, the gap in a monogram, white text knocked out of a solid block. These fill in first, and a filled counter turns a letter into a blob.
• Gaps between elements. The space between two shapes becomes a standing wall of plastic. It has to be as wide as a stroke, and nobody checks it.

Minimum feature size on a 0.4 mm nozzle

A 0.4 mm nozzle lays down a line about 0.42 to 0.45 mm wide. Nothing in the slicer makes it finer. That gives three bands:

The useful version of that is a ratio. Open the artwork, measure the thinnest stroke as a fraction of the logo’s overall width, and you can work out the smallest the mark can be before it starts dropping features:

Most people are engraving onto a face 25 to 40 mm across, where only a mark whose thinnest stroke is around a fortieth of its width comes out whole. Run the same check on the narrowest gap: two shapes that almost touch will merge, and merged is unrecoverable — you cannot sand a gap back in.

Prepare the artwork, do not just upload it

The engraver samples your image and thresholds it: dark areas become the cut, light areas are left alone. Everything below follows from that.

• Pure black on pure white. Mid-greys land on one side of the threshold or the other, and not necessarily the side you expected. Remove the ambiguity yourself.
• Delete drop shadows, glows and outer strokes. A shadow is dark, so it becomes a second cut offset from the first. The mark prints doubled and looks like a registration error.
• Flatten to one silhouette. A two-colour logo has to be resolved into a single decision: which parts are the recess? If both halves carry meaning, engraving cannot express it, and you want the colour-change approach further down.
• Cut the strapline, the registered symbol and any small print. None of it survives, and while it is still there it forces the whole mark smaller to fit the face.
• Crop tight. Padding is scaled along with the logo, so 15% of white margin costs you 15% of mark size.

Vector master, raster delivery

Keep the SVG, AI or PDF as your source, because that is where you can measure strokes and thicken them. Export a flattened PNG for the upload: 4B Engraver takes PNG, JPG and WebP, not SVG.

About 1,500 px on the long edge is right. Below roughly 600 px, curves stair-step visibly in the recess; above about 3,000 px nothing improves, because the nozzle is the limiting resolution and not the pixel grid. Use PNG, not JPG — JPEG compression puts a halo of grey ringing round every edge, which is exactly the mid-grey the threshold has to guess about. A screenshot off a website fails on all of this at once: wrong size, grey fringe, an off-white background, and whatever was sitting behind the transparency. Find the real file.

Size it against the face, not against the part

Measure the flat area, then subtract a margin of 2 to 3 mm all round. More if the edge is filleted: a recess that runs off the flat into a rounded edge loses its outline there and reads as damage. What is left is your logo width, and that is the number that goes into the ratio table above. If the table says the mark needs 64 mm and the face gives you 28 mm, you have your answer already. No depth setting, orientation trick or slicer option closes a gap that size.

When the mark will not shrink, redraw it

This is the part people resist, and it is the only thing that actually works. In order of how well they turn out:

1. Use the brand’s small-size or one-colour variant. Most guidelines contain one, with heavier strokes and no strapline, because someone already fought this battle for embroidery or favicons.
2. Drop the wordmark, keep the glyph. A recognisable symbol at 20 mm beats the full lock-up at 20 mm, which is a smear. Nobody is reading a company name off the underside of a part.
3. Thicken the strokes on purpose. Expand strokes to fills and offset the paths outward until the thinnest one reaches your floor. On an evenly weighted mark this is invisible at a glance. On a high-contrast serif it changes the letterforms, so ask whoever owns the brand first.
4. Use text instead. A name at 5 mm cap height is legible, durable and honest. This is often the right answer and nobody enjoys hearing it.

What not to do is engrave the full detailed logo at 12 mm and hope. The result looks like a moulding fault, and a part that looks faulty does the brand more harm than a blank one.

Orientation: layer lines cross fine detail

Where the engraved face points during printing changes how much detail survives, by a lot.

• Facing up — best. The outline of the mark lives in X and Y, where the machine is precise, and the recess floor is a solid top layer. Stroke ends come out crisp.
• Face down on the bed — smoothest, but fatter. Best surface finish you will get, but the first layer is normally extruded wider than 0.4 mm and squashed outward, so narrow gaps close up here more than anywhere else. Use a 1 mm floor on the bed side rather than 0.8 mm.
• On a vertical face — worst. Horizontal strokes now run along layer boundaries, so their height is quantised to the layer height and their edges stair-step. Keep every stroke at least three layers tall — 0.6 mm at a 0.2 mm layer — and print that part at 0.12 to 0.16 mm layers if the detail matters.

Curved and angled faces distort the artwork and give inconsistent depth across it. Avoid them for logos.

Contrast: a recess only reads if light can cast a shadow

Material colour does more for legibility than depth does. On a light matte PLA — beige, grey, natural — a 0.8 mm recess reads clearly across a room. On glossy black it is close to invisible at any depth, because there is nothing for the shadow to be darker than. If the part must be black, plan the fill from the start.

Paint fill

Cut 0.8 to 1.0 mm, print, then work acrylic or a paint pen into the recess and wipe the surface flush before it sets. The recess holds the pigment and the flat face wipes clean. Below about 0.6 mm there is not enough depth to hold paint and it wipes out with the rest. Do it on a smooth face — a textured build plate traps paint in the texture everywhere, not just in the mark.

Colour change

With a multi-material setup, the better move is often not to cut deeply at all. Make the recess shallow, 0.4 to 0.6 mm, and print that region in a second filament so the mark sits flush as an inlay. The boundary is now between two colours rather than a thin wall that has to stand up unsupported, so a single extrusion width is enough — which roughly halves every number in the ratio table. A mark needing 64 mm as a cut can work at 32 mm as an inlay.

The cheapest version is a painted top layer in the slicer with no geometry change at all: full detail, no strength cost, and it abrades off with handling. Fine for a display piece, wrong for a tool.

Checklist

1. Measure the flat face, subtract a 2–3 mm margin. That is your logo width.
2. Measure the thinnest stroke and the thinnest gap in the artwork.
3. At final width, is every feature 0.8 mm or more? If not, redraw rather than shrink.
4. Strip gradients, shadows, straplines and small print. Flatten to black on white.
5. Export PNG at about 1,500 px, cropped tight, transparency flattened.
6. Depth 0.8–1.2 mm, on an upward-facing flat surface where you can.
7. On a vertical face: three layers minimum per stroke, finer layers.
8. Light matte filament, or commit to a paint fill or colour inlay.
9. Print one at final size and look at it under a lamp before running the plate.