How Small Can You 3D Print Text? Minimum Letter Height and Stroke Width
The smallest 3D printed text that stays readable is about 5 mm tall for raised letters and 3-4 mm for engraved letters, as long as every stroke is at least 0.8 mm wide (two lines from a standard 0.4 mm nozzle). Below that, strokes merge or the slicer drops them.
Font size in points doesn't map cleanly to plastic, so this guide uses letter height in millimeters (the height of a capital letter) and stroke width (the thinnest part of a letter). For choosing the font itself, see the text and engravings guide.
The numbers
| Text style | Minimum letter height | Minimum stroke width | Depth or height |
|---|---|---|---|
| Raised, top face | 5 mm | 0.8 mm | 0.6-1.0 mm raised |
| Engraved, top face | 3-4 mm | 0.6 mm groove | 0.4-0.6 mm deep |
| Raised, side wall | 6 mm | 0.8 mm | 0.6-1.0 mm raised |
| Engraved, side wall | 5 mm | 0.6 mm groove | 0.5 mm deep |
| Two-color, flush or raised | 5 mm | 0.8 mm | at least 0.6 mm of the second color |
| Readable across a room | 15-20 mm | 1.5 mm+ | 1.0 mm raised |
These are starting points for FDM printing in PLA with a 0.4 mm nozzle at 0.2 mm layers, the profile our quotes use. They aren't guarantees for every font: a 5 mm letter in a hairline script will still fail.
Why stroke width matters more than letter height
A printer draws a letter with a line of plastic about 0.42 mm wide. A stroke 0.8 mm wide gets two lines side by side, which prints as a solid shape. A stroke 0.5 mm wide gets one weak line, or nothing: many slicers skip features narrower than one line.
That's why the same 5 mm height works in Arial Bold (strokes about 0.75 mm at that size) and fails in a thin font (strokes under 0.4 mm). Before you pick a size, find the thinnest stroke:
- Type your text in your CAD tool at the size you want.
- Measure the thinnest part of the thinnest letter. In most fonts that's the crossbar of "e" or "t", or the joins in "s".
- If it's under 0.8 mm, make the text bigger or switch to a bolder weight.
Rule of thumb: in a bold sans-serif font, the thinnest stroke is about 15% of the letter height. So a 0.8 mm stroke needs letters about 5.5 mm tall.
Raised or engraved at small sizes
Engraved text goes smaller. A groove is easier to print than a thin wall, because the surface around it holds it in place. At 3-4 mm it reads best with a paint fill or in light directly from the side.
Raised text reads better from a distance. Letters cast shadows on both sides, and you can print them in a second color. They need the extra millimeter of height to keep strokes solid, and they can snag or wear on parts that get handled a lot.
For labels people handle every day (tool cases, part bins, appliance buttons), use engraved. For anything people read from a few feet away (nameplates, signs, ornaments), use raised.
Where the text sits changes the minimum
Top face (facing up). The sharpest place for text. Letter outlines are drawn by the nozzle moving across the surface, so curves stay smooth. Only the raise height is set by layers: at 0.2 mm layers, a 0.6 mm raise is three layers.
Side wall. Layer lines run through every letter, so horizontal strokes (the bars in "E" and "H") step in 0.2 mm increments. Text on walls works from about 6 mm. Make sure raised letters don't overhang more than 45 degrees.
Bottom face (on the plate). Engraved text on the bottom comes out with a smooth plate finish and works well. Raised text on the bottom needs supports and will look rough. Flip the part or move the text.
Curved or angled faces. Stair-stepping eats small text. Keep anything under 8 mm on a flat face.
Two-color text without a second part
The most readable small text is a different color from the plate: white letters on black, or red on white. You don't need two separate parts for that. If the letters start at a different layer height from the plate (for example the plate is 3 mm thick and the letters rise 0.8 mm above it), the color can change at that layer.
At Mandarin 3D that's the multicolor option on the quote page: $3.00 per extra stocked color, up to three, with a one-line note on which parts get which color. Stocked PLA colors are black, white, gray, red, blue and green.
Common mistakes
- Spacing too tight. At small sizes, letters bleed into each other. Add 5-10% letter spacing below 8 mm.
- Text set in points. 12 pt on screen is about 4.2 mm of letter height, and even less for lowercase letters. Measure in millimeters.
- Thin fonts scaled down. A display font that looks fine at 40 mm loses its hairlines at 10 mm. Pick the font at the final size.
- Floating letters. The middles of "O", "A" and "R" are fine when the text is raised from a plate. If the letters are cut out on their own, those middles fall out unless you add stencil bridges.
- Too deep. Engraving 2 mm deep in a 3 mm plate weakens it. Half a millimeter is enough to read.
What it costs to print a nameplate
A plain 200 x 50 mm desk nameplate with a foot (41 g, about 56 minutes of print time) quoted at $11.64 delivered on November 3, 2026: $3.50 order fee, $2.41 for the part, $5.73 USPS Ground Advantage, before tax. Raised text adds a few grams. Two-color text adds $3.00. See how pricing works.
Get your text printed
Have a file? Drop it in the box below for an instant price. Don't have one? Type what it says and how big, and the AI designer builds the model you can check before ordering. A good prompt names the size and letter height, like "a 200 x 50 mm nameplate, my name in raised bold letters 20 mm tall". New to ordering prints? Start with how to get something 3D printed.
Questions
What is the smallest text you can 3D print?
With a 0.4 mm nozzle, raised text stays readable from about 5 mm letter height with strokes at least 0.8 mm wide. Engraved text can go down to 3-4 mm if the grooves are at least 0.6 mm wide and 0.4 mm deep.
How tall should raised letters be?
Raise letters 0.6-1.0 mm above the surface. Less than 0.4 mm barely casts a shadow; more than 1.5 mm makes thin strokes fragile.
Is text more readable on the top or on the side of a print?
On the top face for most text. Side walls show layer lines through the letters, but vertical strokes come out sharp, so side text works from about 6 mm tall.
Can Mandarin 3D print text in a second color?
Yes. Add multicolor on the quote page for $3.00 per extra stocked color and say which parts get which color, for example white letters on a black plate.