How to read a metal 3D printer specification sheet

Every brochure number is true and almost every one is read as more than it is. A specification describes the machine’s published envelope and configuration — it does not establish what your geometry, alloy and volume will actually produce. The core rule: a specification is not automatically an application result.

This guide teaches the questions behind the numbers. The same logic drives our library: every machine profile pairs published facts with explicitly documented gaps.

The ten distinctions that matter at a glance

The spec sheet says	It does NOT establish	Ask instead
Build volume (e.g. 250 × 250 × 325 mm)	That your oriented part, with supports, recoater clearance and thermal strategy, packs into a viable build layout.	"Can you demonstrate a supported build layout for this geometry and process?"
Laser / energy-source power	Part production rate. Power melts a pool; throughput depends on strategy, layers, packing and downtime.	"What accepted parts per month, with this packing and this alloy?"
Layer thickness	Guaranteed dimensional accuracy or surface finish. Those come from process, orientation and machine condition.	"Show me as-built tolerance and roughness data for a comparable geometry."
Listed material	That your application is qualified on it — parameter set, properties, heat treatment. See the qualification guide.	"Which parameter set, with which property evidence, under which qualification?"
Theoretical build rate	Effective production throughput. Skip zones, recoat time, recoater passes and downtime are invisible in a maximum.	"Effective rate on a representative build — with the machine’s own numbers."
Machine footprint	Total installation space. Gas, filtration, powder handling, furnace and clearance live outside the box.	"What floor layout does the complete cell need?"
Maximum power / temperature / speed	Normal production conditions. Maxima advertise capability at the edge, not daily operation.	"What are the normal operating parameters, and with what margin?"
Material compatibility	Qualified mechanical properties. "Titanium supported" is not an aerospace property dossier.	"Where is the property data, and for which condition?"
Number of lasers	Linear productivity. More lasers do not automatically multiply rate — strategy, overlap and powder management intervene.	"How does rate scale on the alloy and parts I will run?"
Public machine price	Total installed investment — see the TCO guide.	"What does the delivered, installed, commissioned, trained system cost?"

Worked example — reading "build volume" as a buyer

A published envelope is the maximum physical space. The usable application envelope is what survives your part’s orientation, support structure, recoater clearance, thermal management and process constraints — sometimes comfortably, sometimes not at all. The machine’s claim ("250 mm cube") and your question ("can this bracket print, packed, with supports, in a stable layout?") are different claims. Ask for the demonstrated layout; a vendor who can show one has run the exercise, and a vendor who cannot is selling you an experiment.

How our library treats this

In the machine library, every fact is source-linked, and every meaningful gap is recorded as an explicit unknown rather than deleted — because an honest "not published" is decision information. "Public evidence gap" is not the same thing as "missing machine capability"; it marks a question for the supplier, not a defect in the machine.

Compare documented machine specifications →