three91 — Software for steel fabrication

A fabrication shop earns its money by getting customer orders through production fast — not by retyping, estimating and tidying up drawings. That prep work is what we take off your hands. So you can do what counts.

A great deal of time disappears long before the machine starts cutting — in the paperwork ahead of it: sifting through enquiries, opening drawings, retyping dimensions, guessing at prices, repairing old CAD files.

We solve that two ways: fully automatic where that works — and as a managed service where experience is needed. So your attention goes to your customers and your production, not to the prep work.

News

What’s happening at three91 right now.

Award · 24 Sep 2026

Last call: EuroBLECH Award voting is open

three91:quote is up for the EuroBLECH Award 2026 — decided 100 % by public vote, no jury. Open until 29 September. From enquiry to quote, in minutes instead of days.

Trade fair · 17 Sep 2026

We’re at EuroBLECH 2026 — Hall 27, Booth M155

20–23 October in Hanover: four days at the booth, a talk and the Award ceremony. Bring a real enquiry — we’ll calculate it live, in under 15 minutes.

Talk · 10 Sep 2026

The most expensive hour is before the machine

Our EuroBLECH talk — no slide deck, shown on real enquiries: where contract manufacturing loses time, and what’s left once the prep work is gone.

Product · 8 Sep 2026

Every value traceable to its source file

New in three91:quote: a provenance view and a confidence level for every reading. One click shows where a quantity, dimension or material came from — you only review what the AI flags as uncertain.

Product · 5 Sep 2026

three91:shape — from drawing to part

Not every drawing can be processed automatically. Our managed CAD service turns 2D drawings into production-ready 3D models. Upload, approve, receive the finished file.

Development · 3 Sep 2026

We keep building — week after week

Recently: RFQ terms like “shot-blasted” are mapped to your work steps automatically, unknown material spellings learned once.

We clear away the prep work.

Two products, one promise: they take off your hands the work that keeps you from your core. One fully automatic, the other as a service.

01 · Sell instead of retypingAutomated

three91:quote

Enquiry in, quote out.

A request for quotation lands in your inbox — the material named in the message, the dimensions in a DXF, the quantities in a PDF. Until now that meant a choice: estimate fast and gamble your margin, or burn hours doing it by hand. three91:quote reads every source, brings it all together with AI, and prices the job in minutes — accurate to the cent.

For estimating & sales

Scattered information. One quote.

MAILMaterialS355 · 8 mm — in the message text

DXFGeometryCutting length · area · thickness

PDFQuantity120 pieces — in the attachment

three91:quote

One complete quote

read · matched · merged · priced

01

Email arrives

The enquiry and its attachments land in the inbox.

02

Read out

Email, DXF, STEP, PDF — geometry, material and quantity are all recognised.

03

Merged

AI groups the data that belongs together and shows it for review.

04

Quote out

A priced PDF — checkable, traceable, ready to send.

A look inside the software

three91:quote — from one enquiry to a calculated quote

01 / 03

From one enquiry: a finished quote

6 positions, 7 attachments (DXF + Excel) — read out, matched and priced to the cent. Ready to release as a PDF.

Where the quantity comes from — highlighted in the Excel list

02 / 03

Where does the quantity come from?

One click on a value reveals its source: quantity 20 pcs — highlighted in the Excel list, row “Zuschnitt 1”. Traceable, not a black box.

Where the cutting length comes from — measured from the DXF geometry

03 / 03

Where does the cutting length come from?

Same position, different source: cutting length 771 mm — measured straight from the DXF geometry. Every value verifiable back to the source file.

What fabricators gain

Massive time savings

Hours of manual work become minutes — email in, quote out.

Focus on what matters

Time for sales and production, not for retyping and re-measuring.

Precise to the cent

Geometry straight from the drawing — traceable back to the source file.

Faster than the competition

Your quote is out before the competition has opened the email.

02 · Fabricate instead of fixing filesService

three91:shape

From drawing to part.

Prepared by a CAD team with 30,000+ datasets delivered.

Not every drawing can be processed all the way automatically. three91:shape is the supervised, expert-backed service for exactly those: experienced CAD engineers turn 2D drawings and unfinished designs into production-ready 3D models — upload, approve, receive the finished file.

For you & your customers

For everything automation cannot solve — unfinished, messy or unusual drawings
A 2D drawing becomes a production-ready 3D model
Dead simple workflow: upload → approve → receive the finished file
For your own use or as a service to your customers — viewer, approval & billing included

2D

What no machine can read

Paper drawings, multi-part DXFs, broken geometry, unusual formats.

Service

Prepared for you

Experienced CAD engineers separate, repair and convert them into production-ready 3D data — through about the simplest workflow imaginable.

5

Formats in the viewer

DXF · DWG · PDF · STEP · 3D. Review, approve, bill — for you or for your customers.

Named after an address. Built for an industry.

three91 stands for Freie-Vogel-Straße 391 in Dortmund — our home. The street name means free bird, which is where both our name and the swallow come from: fast, precise, unwavering.

That is exactly how software for manufacturing ought to feel. Not ponderous and generic, but quick, exact and thoroughly at home in the steel trade — built by people who understand drawings, cutting processes and production.

Sell instead of retyping.
Fabricate instead of fixing files.