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Layer Height, Infill and Walls: 3D Print Settings Guide

By Dynafabs

Layer height, infill and walls explained: choose the right 3D print settings for strength, detail and speed when ordering parts from Dynafabs.

Why print settings matter as much as material

Picking the right filament is only half the job. Two parts printed in the same PETG can behave completely differently depending on how they were sliced. Layer height, infill and wall count decide how strong, how smooth, how heavy and how quick to print your part will be.

The good news is you don't need to be a slicer expert to order well. If you tell us what the part is for, we'll suggest sensible settings. This guide explains what each setting does, so you can make an informed choice (or simply know what to ask for) when you request a quote from Dynafabs.

If you haven't chosen a material yet, start with our PLA vs PETG vs ABS/ASA vs TPU guide, then come back here.

Layer height: detail versus speed

Layer height is how thick each printed layer is. Thinner layers mean finer detail and less visible "stepping" on curved or sloped surfaces. Thicker layers print much faster, and a part with fewer layers is often a little stronger between layers too.

As a rough rule of thumb on a standard 0.4 mm nozzle:

• Fine (around 0.1–0.12 mm): best for small, detailed parts, curved display pieces and anything that will be seen up close.
• Standard (around 0.2 mm): the everyday balance of quality and speed. Most functional parts and prototypes sit here.
• Draft (around 0.28 mm and up): quick test fits, jigs and large parts where looks don't matter much.

Layer lines are most visible on gentle slopes and domes. Vertical walls look similar at most layer heights, so a boxy enclosure rarely needs fine layers, while a figurine or a curved cover benefits a lot.

Walls (perimeters): where most of the strength lives

Walls are the solid outer shells of the part. It surprises many people, but for most parts adding walls improves strength more than adding infill does, because bending and impact loads are carried mainly by the outer skin.

• 2 walls: fine for visual models and light-duty parts.
• 3–4 walls: a good default for functional parts, brackets, clips and anything with screw holes.
• 5 or more walls: for parts that take real load, get tapped or threaded, or need to be sanded and finished without breaking through.

More walls also help with watertightness and give screws something solid to bite into. If your part has holes for bolts or heat-set inserts, mention it and we'll make sure there's plenty of material around them.

Infill: percentage and pattern

Infill is the internal structure inside the walls. It supports the top surfaces and adds stiffness, but it also adds weight, material and print time.

• 10–15%: display models, cosplay props and lightweight covers.
• 20–30%: a sensible default for general functional parts.
• 40–60%: parts that are clamped, squeezed or carry steady loads.
• Close to 100%: rarely needed; extra walls usually achieve more for less.

Pattern matters too. Grid and rectilinear patterns print quickly and suit simple parts. Gyroid and cubic patterns give fairly even strength in all directions, which is helpful when you don't know exactly how a part will be loaded. For flexible TPU parts, lower infill makes the part squishier, which can be exactly what you want for grips and bumpers.

Top and bottom layers

The solid layers that close off the top and bottom of a part are easy to overlook. Too few and you can get gaps or a rough "pillowing" texture over the infill. For most parts we use enough solid layers to give a clean, sealed surface, and we add more when a part needs to be watertight or will be sanded.

Orientation ties it all together

3D prints are strongest along their layers and weakest between them. A tall, thin peg printed upright can snap along a layer line, while the same peg printed on its side is far tougher. Orientation also affects which faces look best and where supports leave marks. When you order, tell us which faces are cosmetic and which direction the load comes from, and we'll orient the part to suit.

Quick starting points by use

• Display model or miniature base: fine layers, 2–3 walls, 10–15% infill.
• Everyday functional part: 0.2 mm layers, 3–4 walls, 20–30% infill.
• Load-bearing bracket or mount: 0.2 mm layers, 5+ walls, 40%+ infill in a tough material like PETG, ASA or a carbon-fibre blend.
• Quick test fit: draft layers, 2 walls, low infill, so you can check sizes cheaply before the final print.

These are starting points, not fixed rules. The right answer depends on your design, material and how the part will be used. You can see what we offer on our materials page and services page.

FAQ

Does 100% infill make the strongest part? Not usually the best value. Extra walls and good orientation tend to add more strength per gram than pushing infill to the maximum.

Will finer layers make my part stronger? Not really. Finer layers mainly improve appearance on curved surfaces. Strength comes more from walls, infill, material and orientation.

I don't know what settings I need. Is that a problem? Not at all. Just tell us what the part does, roughly what load it takes and which surfaces need to look good. We'll recommend settings with your quote. Our FAQ covers other common questions.

Ready to print?

Upload your file and tell us how the part will be used, and we'll suggest the right material and settings. Get a quote from Dynafabs whenever you're ready.

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