PARAMETRIC · 3D · STEP / STL / 3MF
GT2 Timing BeltGT2 TIMING BELT
Enter both pulley tooth counts, the target centre distance and belt width: the closed GT2 loop length is computed, rounded to whole teeth, the real centre distance solved, and a toothed belt exported as STEP, STL or 3MF.
- Pitch2 mm (GT2)
- LengthWhole teeth
- Thickness1.38 mm
- OutputSTEP · STL · 3MF · DXF
LIVE · GT2 TIMING BELT
GT2-220 · 6 mm
SCALE 1:1 · mm
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CALCULATED · SPEC
AUTO-COMPUTED
N
110
Belt teeth
L
220mm
Pitch length
L₀
220.51mm
Theoretical length
C
79.75mm
Actual centre distance
θ1
170.8°
Wrap on pulley 1
θ2
189.2°
Wrap on pulley 2
i
2.000
Speed ratio
HOW-TO
How to generate a gt2 timing belt STEP / STL file
- 1Enter both pulley tooth counts and the desired centre distance.
- 2The spec cards show the rounded belt teeth, length and actual centre distance — use them to buy or print the belt.
- 3Set the belt width; the 3D view shows the closed loop with inner teeth.
- 4Check the spec cards and any warnings.
- 5Download STEP, STL or 3MF — or send it to Orinovate for a quote.
What is a GT2 timing belt?
A GT2 timing belt is a 2 mm-pitch rubber belt with rounded teeth and a fibreglass tension member. It meshes with GT2 pulleys with almost no backlash and drives the XY axes of 3D printers, Z-axis synchronisation and many small mechanisms. Closed loops connect two shafts for reduction or synchronisation; open belts drive linear stages.
Length calculation and rounding
A belt has a whole number of teeth, so its length is always a multiple of 2 mm. This tool computes the open-belt length, rounds it to whole teeth, solves the actual centre distance by bisection and reports the wrap angles. Keep ≥ 120° of wrap and ≥ 6 teeth in mesh on the small pulley.
Specs at default parameters
| Parameter | Value | Range |
|---|---|---|
| Pulley 1 teeth (z1) | 20 | 10–120 |
| Pulley 2 teeth (z2) | 40 | 10–120 |
| Target centre distance (C) | 80 mm | 10–450 |
| Belt width | 6 mm | 3–20 |
| Belt teeth (N) | 110 | — |
| Pitch length (L) | 220 mm | — |
| Theoretical length (L₀) | 220.51 mm | — |
| Actual centre distance (C) | 79.75 mm | — |
| Wrap on pulley 1 (θ1) | 170.8 ° | — |
| Wrap on pulley 2 (θ2) | 189.2 ° | — |
| Speed ratio (i) | 2.000 | — |
FAQ
How is a closed GT2 belt length calculated?
With pitch radii r1 = z1/π, r2 = z2/π and φ = asin((r2 − r1)/C): L = 2C·cos φ + r1(π − 2φ) + r2(π + 2φ). The result is rounded to the nearest multiple of 2 mm (whole teeth) and the centre distance is solved back. Example: 20T–20T at C = 80 mm → L = 160 + 40 = 200 mm (GT2-200, 100 teeth).
Which off-the-shelf loop should I buy?
Closed GT2 loops are sold by pitch length — GT2-200, 280, 400, 610 mm and so on. Compute the length here or with the GT2 centre-distance calculator, pick the nearest size and tension it by adjusting the motor mount.
Can I 3D print a timing belt?
TPU (95A) works for prototypes and light loads, but without a fibreglass or steel tension member it stretches and is less precise than a moulded rubber belt. For positioning, buy a belt; use this model for assemblies and clearance checks.
What are the belt thickness and tooth height?
A GT2 belt is 1.38 mm thick overall with 0.75 mm teeth; the pitch line lies 0.254 mm (PLD) outside the tooth land. The model follows these values, approximating the tooth tip with an arc.
Which software opens the gt2 timing belt 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.
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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.