Ironing Slicer Settings for Glass-Smooth Nameplates

October 5, 2026 · by Grace Hollis · 5 min read

Why Your Nameplates Need Ironing (And How to Dial It In)

If you’ve ever printed a nameplate, sign, or plaque and noticed those faint ridges running across the top surface, there’s a fix for that, and it’s probably already sitting in your slicer. It’s called ironing, and it works by re-tracing the top layer with a hot nozzle running almost no flow, melting those visible lines into something closer to a glass-like finish. Here’s exactly which settings to touch, why each one matters, and where most people trip up when ironing flat-topped prints.

What Is Ironing, Really?

Think of it as a second pass your slicer tacks on after the top layer finishes printing. The nozzle retraces the same path, but this time it’s not laying down a full line of plastic. It’s depositing a thin, almost invisible skin of filament. The heat re-melts the top surface just enough, and the trickle of extra plastic fills in the gaps and ridges that the normal top infill pattern tends to leave behind.

Nameplates are basically the ideal candidate for this trick. A few reasons why:

• They usually have one big, flat top surface (the text area) with nothing to interrupt it.
• Ridging shows up instantly the moment light hits it at an angle.
• A smooth background makes raised or engraved lettering stand out far more.

Which Slicers Support Ironing?

• Cura: tucked under “Experimental” settings.
• PrusaSlicer / SuperSlicer: under “Advanced” > “Ironing”.
• Bambu Studio: labeled simply “Ironing” inside quality settings.

The naming shifts slightly from one slicer to the next, but the underlying mechanics are the same everywhere.

Core Ironing Settings to Adjust

1. Ironing Pattern

You’ll usually choose between Concentric, Zig Zag, and Lines (that’s how Cura labels them).

• Zig Zag is the safe default. Fast, even coverage, works on almost anything.
• Concentric tends to look better on round nameplates, think medallions or coin-style pieces.
• Skip sparse patterns here. Nameplates need full top coverage, not just an outline pass.

2. Ironing Flow

Set this somewhere between 8% and 15%, which is the percentage of your normal print flow used during the ironing pass.

• Go under 5% and you’ll barely notice a difference, ridges will still be there.
• Push past 20% and you risk blobbing, stringing, or a patchy, uneven sheen.
• A good starting point is 10%. Nudge it up or down once you see how your first test print turns out.

3. Ironing Line Spacing

This is how tightly packed the ironing passes are.

• 0.1 to 0.2mm gets you that smooth, almost glassy surface.
• Go wider than 0.3mm and you’ll save a bit of time, but faint lines will creep back in.

4. Ironing Speed

Slow this one down. Think 15 to 20 mm/s.

• Rush it and the nozzle doesn’t have enough dwell time to properly re-melt the plastic underneath.
• Honestly, speed (or the lack of it) is probably the single biggest lever for getting that true glossy look.

5. Monotonic Top Layers

Before ironing even starts, switch your top surface pattern to monotonic in Cura, or turn on the “Fill top one perimeter” style option in PrusaSlicer. This keeps all the underlying top layer lines running in a single direction, so ironing has a clean, consistent surface to work across instead of a jumbled crosshatch.

Recommended Starting Settings

Common Mistakes and Fixes

Problem: The nozzle is leaving tiny blobs or dots behind. Fix: drop ironing flow to 8% and take a look at your nozzle tip. A worn or slightly clogged one will make this worse.

Problem: Some patches still show ridges. Fix: tighten the line spacing, and double check that “Iron All Top Surfaces” is actually switched on, not just applied to the final layer.

Problem: Stringing shows up right after ironing. Fix: if your slicer allows per-feature temperature control, drop the nozzle temp by about 5°C just for the ironing pass. Otherwise, tighten up your retraction settings.

Problem: Ironing is adding too much print time. Fix: limit it to top surfaces only, skip internal flat areas, and bump line spacing up slightly to 0.2mm as a middle ground.

Material Considerations

• PLA: irons beautifully and forgives a lot of mistakes. If you’re new to this, start here.
• PETG: tends to string more during the ironing pass. Lower the flow a touch and make sure cooling is solid.
• ABS/ASA: performs well, but an enclosure helps keep ambient heat steady, which makes a real difference on ironed surfaces.

Final Tips for Nameplates Specifically

• Orient the part so its largest flat face sits on top. That’s where ironing earns its keep.
• Bump top layers up to 4-5. You want enough solid material underneath so the infill pattern doesn’t telegraph through after ironing.
• Run a small test tile with your actual settings before committing to the real nameplate, especially one with engraved text or a logo. It takes ten minutes and saves you a wasted print.

Final Thoughts

Ironing might be the single easiest slicer tweak for making flat-topped prints like nameplates look genuinely professional. Dial in a low flow rate around 10%, tight 0.15mm line spacing, a slow 18 mm/s speed, and pair all of that with monotonic top layers, and you’ll land on a smooth, almost glass-like finish pretty consistently. Start with the numbers above, run one quick test, then fine-tune flow and speed for your own printer and filament. Give it a print or two and you’ll have nameplates that genuinely look like they came off a showroom shelf.