Skip to content

Jet Engine, Geared Turbofan (GTF)

Creation quality: 3.8/5 (4 votes)
Evaluation of members on the printability, utility, level of detail, etc.

  • 2 collections
  • 1 make

Licence CC BY-NC
Last update 2019-09-01 at 00:14
Publication date 2017-10-03 at 16:38
Design number 15538
3D design format
STL and ZIP Folder details Close
  • C-Chamber01.stl
  • CC-HPT-Case101.stl
  • Dummy-BRG-5mm01.stl
  • Dummy-BRG-7mm01.stl
  • Dummy-BRG-9mm01.stl
  • Exhaust-Cone01ws.stl
  • Exhaust-Frame01.stl
  • FDG-Frt-Panel201.stl
  • FDG-Frt-Panel301.stl
  • FDG-Pinion-Spacer01.stl
  • FDG-Pinion401.stl
  • FDG-Ring-Gear-Flange101.stl
  • FDG-Ring-Gear201.stl
  • FDG-Rr-Panel201.stl
  • FDG-Rr-Panel301.stl
  • FDG-SpurGear-8teeth01.stl
  • Fan-BRG-Support201.stl
  • Fan-Blade201ws.stl
  • Fan-Duct01.stl
  • Fan-Frame01.stl
  • Fan-Shaft-Flange01.stl
  • Fan-Shaft-Hub101.stl
  • Fan-Shaft101.stl
  • Fan-Spinner01ws.stl
  • GB-Main101.stl
  • HPC-Case101.stl
  • HPC-Rotor101ws.stl
  • HPC-Spacer01.stl
  • HPT-Rotor201ws.stl
  • Interm-Case101.stl
  • LPC-Case01.stl
  • LPC-Inlet-Case201.stl
  • LPC-Rotor101ws.stl
  • LPC-Spacer01.stl
  • LPT-1-Rotor101.stl
  • LPT-2-Rotor101.stl
  • LPT-3-Rotor101.stl
  • LPT-Case01.stl
  • Parts-List01 (2)
  • Stand-Frt01a.stl
  • Stand-Frt02.stl
  • Stand-Frt101.stl
  • Stand-Rr01.stl
  • Stand-Rr01a.stl
  • Turb-Frame01.stl

Learn more about the formats

3D printer file info

3D model description

Jet Engine; Geared Turbofan (GTF)

For the latest jet engine for passenger planes, the Bypass Ratio is bigger and bigger to improve the engine-performance.
In order for one of them, the Geared Turbofan (GTF) is developed. 3D model for explaining this system was designed and made.

The points of the design are;

Compact "Fan Drive Gear System" which has 3 to 1 Reduction Ratio. (shown by color "RED" in photos)
For the rotation of each spool, the ball bearing method and the dummy bearing method are prepared.
All stator vanes are omitted this time, because of avoiding rub of vanes and blades. And each rotor except LPT is designed with support so that it can be printed as one-piece.
The blade angle is made to agree in the spool rotational direction (View from Rear).
HP Spool: Clockwise
LP Spool: Counterclockwise
Fan: Clockwise
In addition, some parts that printing is considered difficult without support, are prepared STL file with support. The last of two digits of the file name is identified as "ws". In order to ease understanding about the contents of each part and the assembly order, parts breakdown and list are prepared.
Download files includes;
-files: STL Files
-images: Parts Breakdown for assembly Aid
-Excel File: Parts List

Purchase Parts Information;
-Bearings (Can be used Dummy BRGs instead of the followings, See Parts List)
DDL-1370ZZ (7 x 13 x 4) 2ea - For LP-Spool
689ZZ (9 x 17 x 5) 3ea - For HP-Spool and Fan
675ZZ (5 x 8 x 2.5) 2ea - Fan Drive Gear Train

-Aluminum Tubes
See Parts List

Micro screws M1.4x3L - Appox. 60 ea - Direct screw-in to 1 mm dia hole (No nut),
Screws M2 x 6L - 4 ea, See Parts List
Screws M3 x 8L and Washer - 1 ea, See Parts List

Assembly Points

Standard Skill (such as Drilling, Tapping, Filing, Tightening, Painting and Gluing etc) is needed and perseverance too.
For gears: Deburring (removing the sharp edges etc.) is very important for smooth rotation.
HPC and LPC rotor: Take care when removing the support from the blades.
Total Net Print Time: Approx. 31HR

(Estimated as case of PLA, 0.4mm Nozzle, 0.2mm Layer Height, 40% infill and No raft and support)
Note: When at actual print, each parameter should be adjusted by your experience.

Optional Fan; - 2018.2.16
Modified Rotor; - 2018.3.21
[update 2018.07.12]
Revised Description only.
[Update] 2019.09.01
FDG Carrier Parts are modified as follows to improve gear teeth mesh.
1. STL files changed
- Index 11 FDG-Frt-Panel201 → FDG-Frt-Panel301
- Index 15 FDG-Rr-Panel201 → FDG-Rr-Panel301
Please refer Image and Photo are added.
[Update] 2021.07.14
Photo & image size changed

3D printing settings


Doesn't Matter

Doesn't Matter

Depending on parts

Depending on parts


Issue with this design? Report a problem.


Would you like to support Cults?

You like Cults and you want to help us continue the adventure independently? Please note that we are a small team of 3 people, therefore it is very simple to support us to maintain the activity and create future developments. Here are 4 solutions accessible to all:

  • ADVERTISING: Disable your banner blocker (AdBlock, …) and click on our banner ads.

  • AFFILIATION: Make your purchases online by clicking on our affiliate links here Amazon.

  • DONATE: If you want, you can make a donation via Ko-Fi 💜.

  • WORD OF MOUTH: Invite your friends to come, discover the platform and the magnificent 3D files shared by the community!

100% secure payment with PayPal or Credit Card.