Trackball Modification Kit

DIY trackball modification kit to convert a Kensington SlimBlade Pro or SlimBlade Pro EQ into a Rotatrix. More info at rotatrix.com.

Currently in limited beta. I'm releasing kits in small batches to validate compatibility across the SlimBlade Pro population. Pricing and inventory may change as the kit moves toward general availability.

The base trackball is not included — you must supply the SlimBlade Pro or SlimBlade Pro EQ. Make sure it's one of the wireless "Pro" models; they come in black/red, black/gray, and white.

Early adopter price · US$129 · US$149

Order the kit →

Ships free in US · International adds shipping, taxes, duties

Before you order

Pre-test your SlimBlade Pro. Plug it in via USB-C and confirm wired mode works: cursor movement, twist-to-scroll, and all four buttons. Then press the DPI button on the right side — it should blink a blue light cycling through 1, 2, 3, and 4 blinks.

A small number of units work fine in wireless mode but fail wired USB-C, don't respond to the DPI button, or both. Whether that's a factory defect or something the mod can work around isn't something I've investigated — safest to start from a unit that passes both checks.

So far I haven't encountered an incompatible SlimBlade Pro across the units shipped. If you've pre-tested and yours still doesn't work, the mod is reversible and I'll refund your order.

Includes

Add-on controller with firmware and software license pre-loaded. Includes a perpetual software license for the Rotatrix host software.
Wiring cut to length, pre-crimped connector, and device labels.
Detailed install guide.

Requirements

Install takes about an hour: disassembling the SlimBlade Pro and soldering 30 AWG wire to circuit board pads and component legs. Achievable by a careful hobbyist.
You'll need: soldering iron with a fine tip, wire strippers, flush cutters, a small screwdriver, a plastic pry tool, and tape.

The detailed instructions have been tested by several makers without issue, and support is available via email and Discord if anything comes up during assembly.

Software & OS

Works with

FusionBlender4.2+OnshapeFreeCAD1.0+

on Windows 10+, macOS 15+, and Linux.

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NOTICE: This modification involves disassembly, soldering, and internal hardware changes to your Kensington SlimBlade Pro trackball. The user should have appropriate experience with electronics work and use proper safety equipment.

Performing this modification will void Kensington's manufacturer warranty on the original device. By performing the modification described in this guide, you assume all risk. Icebound Flame LLC is not responsible for any damage to your device, components, connected equipment, or for any injury to persons resulting from the modification.

Questions

Email david@rotatrix.com.