PARAMETRIC · 3D · STEP / STL / 3MF
SphereSPHERE
Enter a diameter to generate an exact sphere with volume and surface area, and download STEP, STL or 3MF.
- SurfaceExact B-rep
- OutputSTEP · STL · 3MF · DXF
LIVE · SPHERE
⌀20
SCALE 1:1 · mm
Drag to rotate · scroll to zoom · right-drag to pan
CALCULATED · SPEC
AUTO-COMPUTED
V
4188.8mm³
Volume
A
1256.6mm²
Surface area
C
62.83mm
Great-circle circumference
HOW-TO
How to generate a sphere STEP / STL file
- 1Enter the sphere diameter.
- 2The model touches z = 0, ready to drop on the build plate.
- 3Check the spec cards and any warnings.
- 4Download STEP, STL or 3MF — or send it to Orinovate for a quote.
What is a sphere?
A sphere is the set of points at distance r from a centre — the shape with the smallest surface for a given volume. It is used for bearing balls, knob heads, models and teaching aids. This tool outputs an exact B-rep sphere, not a polygon approximation.
Formulas
Volume V = (4/3)πr³; surface area A = 4πr²; circumference C = 2πr = πD. Volume scales with the cube of the diameter: double D and the volume grows 8×.
Specs at default parameters
| Parameter | Value | Range |
|---|---|---|
| Diameter (D) | 20 mm | 0.5–1000 |
| Volume (V) | 4188.8 mm³ | — |
| Surface area (A) | 1256.6 mm² | — |
| Great-circle circumference (C) | 62.83 mm | — |
FAQ
How do I 3D print a sphere reliably?
A sphere touches the bed at a single point. On FDM use supports plus a brim, or open the STEP in CAD and slice 1–2 mm off the bottom for a flat base. For resin, hollow it and add drain holes.
What are the sphere formulas?
Volume V = 4/3·π·r³ and surface area A = 4·π·r². A 20 mm sphere is about 4,188.8 mm³ (4.19 mL) with 1,256.6 mm² of surface.
Why does the STL look faceted?
STEP keeps the exact curved surface; STL / 3MF are triangle meshes. The tessellation is fine enough for printing — export from CAD with a tighter tolerance if you need it smoother.
Which software opens the sphere STEP file?
STEP (AP214) opens in Fusion 360, SolidWorks, FreeCAD, Onshape and Rhino. STL / 3MF import directly into Bambu Studio, PrusaSlicer or Cura.
Is it free?
Yes — no sign-up, no fees. Need a physical part? Send it to Orinovate for an instant quote in FDM, SLA, SLS, MJF or CNC.
Related generators
Need a physical part?
Send the model straight to Orinovate's instant quote: FDM, SLA, SLS, MJF, metal printing and CNC, made in Hsinchu, Taiwan.
About STEP / STL / 3MF / DXF
- STEP (.step / .stp, AP214) keeps exact dimensions and surfaces for editing in Fusion 360, SolidWorks or FreeCAD.
- STL and 3MF are triangle meshes that import directly into Bambu Studio, PrusaSlicer or Cura.
- DXF is the top-view 2D outline, ready for laser cutting, waterjet or CNC routing.
- All models are in millimetres at true scale.