✦ Design with AI

FlatCad3D

Free 3D CAD for 3D printing, right in your browser. No signup. Add shapes, drill holes, add text, then export STL or 3MF for your slicer.

Start from an example

Drag to orbit · right-drag to pan · scroll to zoom · click a shape to edit its numbers on the right.

FlatCad 3D help

Every part is a list of features (the Features tab on the right), applied top to bottom. Each one adds material, cuts it away, or keeps only the overlap. Click a feature to change its numbers; the part rebuilds instantly.

Mouse

Left-drag

Orbit

Right-drag / Shift-drag

Pan

Scroll / pinch

Zoom

Click a face

Select the feature that made it

Keys

B

Box: click two corners, then pull up a height (or type w,d and the height). Push into a face to cut

P

Push/Pull: click a face, move it, click or type how far

C S T

Cylinder, sphere, text: click where to put it

H

Hole: click any face, it drills straight in

K

Sketch: click points on a face or the bed, Enter to finish, then set the height

M / Q

Move / rotate: click a base point, then where it goes, or type it. Ctrl copies

G / R

Move / rotate the selected feature with handles

D

Measure between two points

Ctrl+D

Duplicate selected

Del

Delete selected

Ctrl+Z

Undo (Ctrl+Shift+Z redo)

F

Zoom to fit

0 7 1 3 5

3D, top, front, right view; ortho on/off

Esc

Cancel tool / deselect

Tips for printing

Keep the part flat on the bed (z = 0). Walls 1.2 mm or more. Screw holes: M3 = 3.4 mm, M4 = 4.5 mm. The stats (top left) show size, volume and roughly how much PLA it uses.

Units are millimetres. Z is up. Want a 2D drawing for a laser or CNC instead? Use FlatCad 2D.

Guides: make an STL · design with ChatGPT or Claude · edit an STL · floor plan to 3D · all tools