Best Print Settings for a 3D-Printed Bookmark

A bookmark is one of the friendlier things you can print: it's small, it's flat, and it doesn't need supports. But "thin and flat" brings its own quirks: bed adhesion matters more, and layer height changes how crisp the design reads. None of these settings are baked into the file ButterySpace gives you (that's just geometry), so here's a sensible starting point you can dial in for your own printer and filament.

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Orientation: lay it flat

Print the bookmark flat on the bed, largest face down. This is almost always the right call for a thin relief part:

• The design relief faces up, so it prints with clean top layers.
• No supports are needed, because there's nothing overhanging.
• The part is strongest across its width and most resistant to snapping along layer lines.

Avoid standing the bookmark up on its edge. A tall, thin print is slow, prone to wobble, and weak along the layer lines exactly where a bookmark gets flexed.

Layer height: trade speed for crispness

• 0.2 mm is the standard default. Fast, and fine for bold designs and text.
• 0.12–0.16 mm is better for fine relief, small lettering, or detailed artwork. Slower, but the design reads more sharply.
• 0.28 mm+ is fast and fine for very simple shapes, but soft on detail.

If your bookmark has small or intricate features, drop the layer height before you reach for anything fancier. It's the single biggest lever on how good the result looks.

Bed adhesion: the thing most likely to go wrong

Thin, flat parts have a lot of surface area touching the bed and not much height holding them down, so they can lift at the corners (warping) or get knocked loose. A couple of cheap insurances:

• Add a brim (5–8 mm is plenty). It dramatically improves adhesion and peels off easily after printing.
• Slow the first layer and make sure your first-layer height and bed level are dialed in.
• Clean the bed. A wipe with isopropyl alcohol fixes more adhesion problems than any setting.

Walls, infill, and thickness

• Walls / perimeters: 2–3 is plenty for a flat part. The relief detail comes from the top layers more than the walls.
• Top layers: use enough (4–5 at 0.2 mm) to fully close the surface so the design isn't pocked with gaps.
• Infill: a bookmark is thin enough that infill barely matters, so 10–15% is fine. If the part is very thin, it may be solid anyway.

Supports

You don't need them. Printed flat, a bookmark has no overhangs. Leave supports off, since they'd only mar the underside and waste filament.

Temperature and filament

The file does not set a temperature, so use your filament's normal profile. As a starting point for the materials we reach for most:

• PLA: around 200–210 °C nozzle, 55–60 °C bed. Crisp detail, easy to print, but the most brittle of the bunch when a bookmark gets flexed.
• PETG or PLA+: PETG around 235–245 °C nozzle, 70–80 °C bed; PLA+ near its PLA range. Both flex without snapping, which is what you want in a part that lives in a book and gets bent.

On our own bookmark prints, nudging the nozzle 5 °C above the normal profile has improved layer bonding on thin parts. Treat that as a test, not a universal rule: stay inside the filament maker's stated range, raise the temperature in small steps, and watch for stringing or softened detail. Keep your filament dry while you are at it, since damp filament prints rough on the fine top layers where the design lives.

A note on durability

Bookmarks get bent. If yours snaps, the usual causes are a too-thin cross-section or weak layer adhesion. PETG and PLA+ flex more forgivingly than brittle PLA (opens in a new tab); printing a touch hotter improves layer bonding; and printing flat (as above) keeps the bending load across layers rather than trying to peel them apart.