What is the smallest feature an FDM printer can make?

With a standard 0.4mm nozzle, the thinnest wall is 0.4mm (single extrusion width). The smallest hole is about 0.8-1mm diameter. Features smaller than the nozzle diameter cannot be reliably reproduced.

Can resin printers produce smaller features?

Yes, significantly. Resin printers have XY resolution of 0.035-0.05mm (pixel size), allowing features as small as 0.1mm. This makes them ideal for miniatures, jewellery, and dental models requiring fine detail.

Why do small holes print closed?

The nozzle extrudes a bead wider than the hole diameter, causing the extruded material to fill the hole. Holes need to be at least 2x the nozzle diameter. You can drill out smaller holes after printing.

How do I print very fine pins and posts?

The common FDM design rule is a minimum pin diameter of about 4x the nozzle/line width — roughly 1.6mm for a 0.4mm nozzle — with 3mm recommended for any pin that has to bear load. Below the 4x limit the nozzle struggles to trace a full circle and the pin prints weak or distorted. Reduce print speed and increase part cooling for thin features, and where possible use an off-the-shelf dowel pin instead of printing one. Resin printers can produce pins down to about 0.5mm.

Does layer height affect XY resolution?

Layer height primarily affects Z resolution and surface smoothness, not XY detail. However, thinner layers mean more precise positioning of features that start/stop at specific heights. XY resolution is mainly determined by nozzle size (FDM) or pixel size (resin).

3DPrintCalcs

Minimum Feature Calculator — Smallest Printable Details

Calculate the smallest feature size your printer can reliably produce.

Nozzle Diameter

For FDM printers

Layer Height

Height of each layer (FDM ~0.1-0.3mm; resin ~0.025-0.05mm)

Feature TypeThe feature you want to check

Printer TypeFDM uses nozzle width; resin uses pixel size

How We Calculate This

Minimum Feature Formulas (FDM)

Min wall width = Nozzle diameter (single perimeter)
Min height = Layer height (single layer)
Min hole diameter = Nozzle diameter x 2
Min slot width = Nozzle diameter x Wall Multiplier (default 1.2)
Min pin diameter = Nozzle diameter x Detail Multiplier (default 4)

FDM resolution is fundamentally limited by the nozzle diameter in XY and layer height in Z. Features smaller than these limits will either be skipped by the slicer or printed with poor quality. The Wall and Detail multipliers are adjustable in Advanced Options — the defaults follow common design rules (a pin around 4x the nozzle/line width, with 3mm safer for functional pins).

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify settings with test prints before committing to final prints.