Quad Quad Planetary Gear built in FreeCAD using the new Integrated Assembly Workbench with design files included!

This is an old design brought back to life to live again using the new FreeCAD Integrated Assembly Workbench. I originally made this using the Part Design, Gear and the Assembly4 Workbench. I hope you enjoy this Planetary and learning and using FreeCAD. I used to teach educators how to use an enormously expensive proprietary Design System used by the world's largest manufacturing corporations but have always followed FreeCAD's development. I'm not a Pro with FreeCAD or anything else any longer but I hope the design files help you to learn FreeCAD. It is a great system with no strings attached and a growing user base.

I have included the two FreeCAD design files. One subassembly file- planetsubassem.FCStd, and the main design file- quad_quad_intergrated_assem_wb.FCStd  that calls the sub. I have also printed an STL and included this file as well.

The Printables web system removes uppercase from file suffixes during upload and for those in Linux or other OSes, as I am, must rename planetsubassem.fcstd to planetsubassem.FCStd.

This planetary's diameter to height ratio,  due to the many parts, is larger than other gear sets so getting a super tight feel without various parts getting partially fused together is difficult.  I suggest just scaling Z up to 120% or more. This will help. Also, altering the backlash and clearance in the Involutegear features is very easy.

Mechanical clearances have been set up for a modern accurate printer. The clearances that I have built into the planetary average from 0.13 to 0.25 mm and print well on my Voron. An Ender V1/2 or similar will require about 0.4 mm from my experience. Just drop the files into FreeCAD to make them right for you. Printing one small planet subassembly is a fast way to check how it will work for your device. 

I have included the FreeCAD design files. I hope this helps others to learn FreeCAD :-)

Enjoy!

You may also be interested in my other Voron Trident mods shown here or at https://www.printables.com/@JimChristian_3198049  &  https://www.printables.com/@JimChristian_3198049/models  They work well  :-)

-

Also, if you find value in this, please give it a like. Thanks :-)

-

This was redone in a FreeCAD system that I compiled from sources:

OS: Debian GNU/Linux 13 (trixie) (X-Generic/xwayland)

Architecture: x86_64

Version: 1.2.0dev.45000 (Git)

Build date: 2026/01/09 23:48:40

Build type: Unknown

Branch: main

Hash: fe86abea92afd3ce0e0dd568c545c351b6204b7e

Python 3.11.13, Qt 6.8.3, Coin 4.0.3, Vtk 9.3.1, boost 1_86, Eigen3 3.4.0, PySide 6.8.3

shiboken 6.8.3, xerces-c 3.3.0, IfcOpenShell 0.8.2, OCC 7.8.1

Locale: English/United States (en_US)

Navigation Style/Orbit Style/Rotation Mode: Blender/Rounded Arcball/Window center

Stylesheet/Theme/QtStyle: Darker.qss/Darker/

Logical DPI/Physical DPI/Pixel Ratio: 96/96.237/1.25

Installed mods:

* OpenTheme 2025.5.20

* ProDarkThemePreferencePack 1.0.0

* freecad.gears 1.3.0

* FreeCAD-themes 2025.6.4

* Assembly4 0.60.4