WOW3DPRO

Infill

Infill density
selection guide

How infill affects strength, weight, price, and print time — with starting ranges by use case.

Quick answer

Start with 10–20% infill for visual mock-ups, 20–40% for general prototypes and 40–80% for functional or load-bearing parts. Higher infill adds strength but also material cost and print time, and 100% is rarely necessary.

By Seo Jeongju, CEO of WOW3DLast updated First published

What is infill?

It is how densely the inside of a part is filled. Higher means more material, time, and strength; lower means lighter and cheaper.

What infill percentage should I use?

Start around 10–20% for visual mockups, 20–40% for general prototypes, and 40–80% for loaded functional parts — then test.

How does infill affect price?

Higher infill raises material and machine time together. Change the slider in auto-quote to see the difference instantly.

Real Output

Real 3D printing work by WOW3D

Parts we printed in-house on FDM, SLA and DLP machines. See more in the print gallery.

  • Garment buttons and jig — Black resin DLP 3D printed part by WOW3D

    Garment buttons and jig

    DLP · Black resin

  • Scale model car tires — Flexible resin DLP 3D printed part by WOW3D

    Scale model car tires

    DLP · Flexible resin

  • Bottle cap prototype — White resin DLP 3D printed part by WOW3D

    Bottle cap prototype

    DLP · White resin

  • Arduino product enclosure — PLA FDM 3D printed part by WOW3D

    Arduino product enclosure

    FDM · PLA

View more work

FAQ

Is 100% infill always better?

No. Weight, cost, and time jump a lot, and mid-density infill is enough for many uses.

Does infill matter for thin-wall models?

Thin walls limit what infill can do — wall thickness design often matters more.