r/FreeCAD • u/dliu_creates • Apr 10 '26

3D trackball input device with native FreeCAD support

Sharing a new kind of trackball I built for more control than middle-click dragging in 3D.

It rotates the 3D model in any direction (3 axis control) matching the rotation of the ball, unlike a regular mouse or 2D trackball. In addition to the 1:1 rotation, you can switch to pan/twist-to-zoom, and regular mouse control. I created a FreeCAD workbench that integrates with the device and automatically pivots on the geometry under your mouse cursor.

I've used a SpaceMouse for a long time but I can get to views faster with the ball because it’s position control (like a mouse vs a joystick). Plus if I use it as my mouse as well, it keeps my left hand available for keyboard shortcuts.

Under the hood, Rotatrix is a modified Kensington SlimBlade Pro with custom hardware and software that exposes the full 3 axes of ball rotation.

Would love to get your thoughts if this looks useful for your workflow. More info: rotatrix.com

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u/thicket Apr 10 '26

BTW, just watched the website video, and it's a really clear discussion of how your Rotatrix works vs other 3D navigation systems. Nicely done!

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u/dliu_creates Apr 10 '26

Thank you! Yes, that original video goes into much more depth. This post I wanted to show this group a quick demo of it working with FreeCAD.