Primitive Shapes STL Generator — Cube, Sphere, Cylinder, Torus & More
Create exact test shapes — boxes, cylinders, tubes, spheres, tori, pyramids, wedges and more — as STL · free, no signup
See Primitive Shapes STL Generator — Cube, Sphere, Cylinder, Torus & More in action
Free Primitive Shape STL Generator
Calibration cubes, spacers, test cylinders and blocks are the building blocks of every printing workflow, and downloading a fixed-size STL is never quite the size you need. Choose a shape, enter exact dimensions and download a watertight, correctly oriented solid that sits flat on the bed.
Thirteen shapes are included: box, rounded box, cylinder, tube, cone and frustum, sphere, dome, capsule, torus, regular prism, pyramid, star prism and wedge. The tool shows volume, surface area, PLA weight and checks that the mesh is closed. Everything runs in your browser.
Key features
13 shapes
Boxes, round shapes, prisms and more.
Exact dimensions
Specify size in millimetres.
Volume and weight
See volume, surface area and PLA weight.
Closed solid check
Verified watertight.
How to use it
- Pick a shape.
- Enter the dimensions.
- Check the preview and stats.
- Download.
Worked example
Example
A cylinder of radius 8 mm and height 15 mm with an 8 mm bore is a tube with a volume of 2.26 cm³ that weighs about 2.8 g in PLA.
Who uses this tool
Printer owners
Calibration and test shapes.
Designers
Quick blocks and spacers.
Teachers
Geometry models.
Makers
Base shapes to combine.
Tips for the best results
- Use the Boolean tool to combine shapes.
- Use High smoothness for round shapes.
- Check the print orientation.
- Scale in your slicer if needed.
Common mistakes to avoid
- Making a tube with a bore bigger than the diameter.
- Low smoothness for large spheres.
- Forgetting the pyramid base for overhang tests.
Why use AZRS QuickFix?
It is 100% free, needs no signup and has no watermark or usage limits. The tool runs in your browser, so what you type stays on your device, and it works on phones, tablets and desktops. New tools are added every week — bookmark this page or browse the full QuickFix toolbox.
Frequently asked questions
Are shapes manifold?
Yes.
Where is the origin?
Centred on X and Y with the bottom on Z = 0.
Can I make a hollow shape?
Use the tube or the hollow tool.
Is it free?
Yes.