nurb · describe the part, print the part
design 3d-printable parts by talking
Describe the part.<br>Print the part
◂no CAD software · no tutorials · no failed prints ▸
nurb gives the AI you already talk to real CAD skills. Say what you need, watch it take shape live , hit print.
Download for Mac<br>free · open source · Apple silicon · runs on your computer<br>or in the terminal<br>$curl -fsSL https://nurb.dev/install.sh | shcopy
// 01 the whole idea
You say it. It appears. This one is live.
Make an adapter that connects my shop vac hose to the dust port on my table saw
Done: Ø57.6 → Ø35.0 · 74 mm , all checks clean. Drag the sliders to tweak it.
nurb desk
hose_adapter1 ms
parameters
v0.5.0 · the sliders come from the part, not a settings screen
stl<br>step
drag to orbit · scroll to zoom
This demo is a lightweight imitation; the real thing runs a full engineering CAD kernel. The STL you download here is real and printable, though. Go print it.
// 02 the conversation
Revisions are sentences too.
Look at the part, say what's wrong with it. CAD software never opens.
It wobbles on the vac hose, way too loose
Measure the outside of the hose end for me. Calipers if you have them, a careful ruler works.
57.4
Bored the cuff to 57.6 mm , a snug push fit. Checks still clean, and the stl button has your file.
measures, never guesses It asks for the real dimension instead of inventing one.
millimeters, not menus Every dimension becomes a slider. Automatically.
your tweaks stick Drag, save. Your AI keeps designing from your numbers.
files that just work STL for your slicer. STEP if a machine shop asks.
// 03 how it works
You talk. It models. Physics checks the work.
Three things happen. You only do the first.
you
Say what you need. It asks for measurements instead of guessing.
your browser
hose_adapter rebuilt
Ø57.6 → Ø35.0 · 74 mm
0.3 s · your view stays put
Watch it take shape. Live, and the camera never jumps.
the check
walls thick enough everywhere
bed grip plenty of plate contact
steep slope bore shoulder at 52°, stretch the taper
Failures get caught before your printer finds them.
// 04 the safety net
Nine hours of printing. Checked before it starts.
Calibrated on parts that really printed, and it knows which printer you own.
steep slopes overhangs that sag or peel away as they print
thin walls sections finer than your nozzle can lay down
tiny details features that smear instead of printing
mid-air starts material with nothing underneath to land on
top-heavy shapes tall parts that tip over before they finish
long reaches juts that sag under their own weight, or snap in use
loose pieces a part that quietly came apart into two
the wrong size too big for the machine you actually own
// 05 the real world
Point your phone at it.
Some shapes don't come from numbers. Sweep the thing for ten seconds and your part gets built against its real contour.
the chat
I can't measure this, it's all curves
Scan it with your phone instead. Ten seconds, then drop the file here.
It offers. You never have to know this was possible.
your phone
free scanning app
sweep the siding · 10 s
export the file
Sweep it. No special hardware, no turntable, no rig.
your browser
300 × 250 mm
5 mm step between courses
bracket hugs the profile
It reads the shape. In millimeters, then builds to it.
// 06 more than one part
It opens the lid before your printer does.
A door can build clean, check clean, print beautifully, and still not open. Parts that work together get tested together.
a box for the shelf, with a lid that flips up
Both parts are modelled. Swinging the hinge, it jams at 84° on the shelf above.
can it clear?
Moved the pivot forward 3 mm. It now opens to 110° and stops there on purpose, so the lid rests instead of falling back.
tested as a set Parts that mate get built and checked together, not one at a time.
the whole swing It runs the hinge through its full travel and names the angle where it hits.
the wall counts Describe the shelf or the machine it mounts to and that gets included.
drag it open The joint angle is a slider. Move it and the whole assembly moves.
// 07 get started
One download and a sentence.
The Mac app is the whole thing in one window. The command line works with Claude Code, Cursor, Codex, Copilot, and friends.
Download nurb for Mac<br>Your projects, your AI, and the live viewer side by side. It sets everything up the first time you open it and updates itself. Apple silicon Macs.
Rather work in the terminal? One paste installs nurb and teaches your AI how printable parts are designed:
$curl -fsSL https://nurb.dev/install.sh | shcopy
Make an adapter that connects my shop vac hose to the dust port on my table saw<br>Your AI models it, checks it, and sends you a link to watch. Looks right? Print.