Minimum wall thickness: Minimum wall thickness is the thinnest wall a manufacturing process can produce reliably in a given material, below which walls may fail to form, warp or break.
Every process has a floor below which walls stop being reliable. In 3D printing the limit comes from the nozzle width, the laser spot or the pixel size, plus the strength of a thin section during printing and post-processing. In machining it comes from the wall flexing under the cutter. In moulding it comes from how far molten plastic can flow before it freezes.
The limit depends on the process, the material and whether the wall stands alone or is supported. As a general guide for 3D printing, supported walls are often around 0.6-1.0 mm for resin and powder processes and around 0.8-1.2 mm for FDM, with free-standing or tall walls needing more. Treat these as typical ranges, not rules: your machines and materials set the real number.
Example: a buyer sends an enclosure with 0.5 mm walls for an SLS print. The shop’s minimum for nylon is 0.8 mm. The wall may print, but it is fragile and may break during powder removal. A DFM check flags it so the buyer can thicken it to 1 mm.
A common confusion is between wall thickness and detail size. A 0.3 mm embossed letter can print well on a resin printer, but a 0.3 mm wall holding up a structure will not.
Quotometry measures wall thickness from the part’s geometry and flags walls below the shop’s limit as a DFM issue the buyer sees. Read minimum wall thickness for typical values by process.
Go deeper: Minimum wall thickness by process: FDM, SLA, SLS, MJF, metal, CNC, sheet, moulding