PARAMETRIC · 3D · STEP / STL / 3MF
GT2 Pulley GT2 36T · 9 mmGT2 PULLEY
Free STEP, STL and 3MF download of a gt2 pulley GT2 36T · 9 mm with live 3D preview. Key dimensions: Pitch diameter 22.92 mm, Outside diameter 22.41 mm, Root diameter 20.91 mm, Toothed length 10.0 mm. Every parameter stays adjustable, and you can send it straight to Orinovate for printing.
- Pitch2 mm (GT2)
- Teeth10–120
- FlangesNone / Idler / Pulley
- OutputSTEP · STL · 3MF · DXF
LIVE · GT2 PULLEY
GT2 36T · 9 mm
SCALE 1:1 · mm
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CALCULATED · SPEC
AUTO-COMPUTED
PD
22.92mm
Pitch diameter
OD
22.41mm
Outside diameter
Df
20.91mm
Root diameter
b
10.0mm
Toothed length
L/rev
72mm
Belt travel per rev
Df'
26.41mm
Flange diameter
Dh
19.0mm
Hub diameter
L
20.0mm
Overall length
HOW-TO
How to generate a gt2 pulley STEP / STL file
- 1Enter tooth count and belt width — the GT2 profile updates live.
- 2Choose the flange mode: none, idler or pulley with hub.
- 3Set bore, bore type and set-screw hole; add bore clearance for 3D printing.
- 4Check the spec cards and any warnings.
- 5Download STEP, STL or 3MF — or send it to Orinovate for a quote.
What is a GT2 pulley?
GT2 is a 2 mm-pitch timing-belt system with a rounded tooth that meshes with almost no backlash, the standard linear drive on 3D printers, laser engravers and small CNCs. Drive pulleys clamp to the motor shaft with a set screw and usually run 6 or 9 mm belts; idlers spin on bearings to guide the belt.
Key dimensions and selection
Pitch diameter PD = z·2/π; outside diameter OD = PD − 0.508 mm; groove depth ≈ 0.75 mm. Fewer teeth give finer resolution but less wrap and fewer teeth in mesh — use at least 12–16 teeth and ≥ 6 teeth in mesh. Flanges at OD + 4 mm keep the belt from walking off.
Specs at default parameters
| Parameter | Value | Range |
|---|---|---|
| Teeth (z) | 36 | 10–120 |
| Belt width | 9 mm | 3–20 |
| Flange mode | Pulley (flanges + hub) | No flanges / Idler (two flanges) / Pulley (flanges + hub) |
| Hub size | Auto | Auto / Custom |
| Hub diameter | 16 mm | 4–100 |
| Hub length | 7 mm | 0–50 |
| Bore (d) | 8 mm | 0–60 |
| Bore type | Round | Round / D-cut |
| Set-screw hole | M3 | None / M3 |
| Bore clearance | 0 mm | 0–1 |
| Pitch diameter (PD) | 22.92 mm | — |
| Outside diameter (OD) | 22.41 mm | — |
| Root diameter (Df) | 20.91 mm | — |
| Toothed length (b) | 10.0 mm | — |
| Belt travel per rev (L/rev) | 72 mm | — |
| Flange diameter (Df') | 26.41 mm | — |
| Hub diameter (Dh) | 19.0 mm | — |
| Overall length (L) | 20.0 mm | — |
Popular gt2 pulley sizes
- GT2 16T · 6 mm
- GT2 16T · 6 mm
- GT2 16T · 9 mm
- GT2 16T · 9 mm
- GT2 20T · 6 mm
- GT2 20T · 6 mm
- GT2 20T · 9 mm
- GT2 20T · 9 mm
- GT2 30T · 6 mm
- GT2 30T · 6 mm
- GT2 30T · 9 mm
- GT2 30T · 9 mm
- GT2 36T · 6 mm
- GT2 36T · 6 mm
- GT2 36T · 9 mm
- GT2 36T · 9 mm
- GT2 40T · 6 mm
- GT2 40T · 6 mm
- GT2 40T · 9 mm
- GT2 40T · 9 mm
- GT2 60T · 6 mm
- GT2 60T · 6 mm
- GT2 60T · 9 mm
- GT2 60T · 9 mm
FAQ
What is the outside diameter of a GT2 pulley?
Pitch diameter PD = teeth × 2 mm / π; outside diameter OD = PD − 2 × 0.254 mm (pitch-line differential). 20T: PD 12.73 mm, OD 12.22 mm. 16T: PD 10.19 mm, OD 9.68 mm.
How far does the belt move per motor revolution?
Travel per rev = teeth × 2 mm, so 40 mm for 20T. With a 1.8° stepper at 16 microsteps: steps/mm = 200 × 16 / 40 = 80. The steps-per-mm calculator does this for you.
Can GT2 be mixed with T2.5 or MXL?
No. GT2 has a curvilinear 2 mm-pitch tooth; T2.5 (2.5 mm trapezoidal) and MXL (2.032 mm trapezoidal) are incompatible and will skip and wear quickly.
How accurate is the tooth profile?
The GT2 groove is approximated with arcs and tangents: R0.555 mm bottom, 0.75 mm depth, ≈1.41 mm wide at the OD, with the standard 0.254 mm PLD. It works well for 3D printing and general drives; for precision positioning use a machined pulley or tune from measurement.
Which software opens the gt2 pulley 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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- GT2 timing pulley guide: tooth count, belt width, flanges and centre distance2026-10-06
- How to calculate stepper motor steps/mm: belts, leadscrews, microstepping and Marlin / Klipper setup2026-10-07
- Belt vs lead screw vs ball screw vs rack and pinion: how to choose a linear drive (accuracy, speed, backlash, steps/mm)2026-10-07
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.