Free STL Generator

Free 3D Shape Generator: box, cylinder, cone and tube STL

Need a spacer, a washer, a block or a test print in exact millimetres? Pick a shape, type the sizes and download the STL. No CAD program needed.

How to use it

  1. Pick a shape: box, cylinder or prism, cone or pyramid, tube or ring, sphere, torus or torus knot.
  2. Type the sizes in millimetres.
  3. Download the STL and slice it.

Printing tips

  • A cylinder with 6 sides is a hex; 4 sides on a cone makes a pyramid.
  • Tubes make quick spacers and washers: set the inner radius a little above your bolt's radius.
  • The torus knot is a good test print for overhangs and cooling.

Questions

Are the sizes exact?

Yes, the model is built in millimetres to the sizes you type. Your printer's tolerance (usually ±0.1 to 0.2 mm) still applies, so allow a little clearance for parts that fit together.

What's a torus knot for?

It's a classic test print: lots of overhangs and curves that show how well your printer handles cooling and bridging.