scatterthought

scatterthought / semistatic-bearing

Public

Official repository for the semistatic trackball bearing

19
0
100% credibility
Found Jun 01, 2026 at 19 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
AI Summary

This is an open-source project that provides free 3D-printable designs for specialized ball bearings used in trackball computer mice. Instead of buying expensive factory-made bearings, users can print their own cases and assemble them with tiny ceramic balls they purchase online. The project includes multiple designs compatible with popular trackball brands like Ploopy, Endgame, and Kensington, along with detailed instructions for printing, assembly, and maintenance. It's designed for trackball enthusiasts who want a smoother, quieter, and more affordable alternative to traditional ball transfer units.

How It Works

1
🖱️ You discover trackballs

You've been using a regular mouse but heard trackballs are smoother and easier on your wrist, so you start looking into them.

2
🔍 You learn about bearings

You find out that the tiny balls underneath the trackball make all the difference, and expensive ones can be noisy or hard to find.

3
💡 You find a better way

Someone created 3D-printed bearing designs that work just as well, cost only about $1 each, and are super quiet.

4
You pick your trackball model
🏢
Endgame or similar

You download the BR8 model that fits 8mm ball transfer units

📦
Ploopy Nano

You download the VC75 model that fits 7.5mm Veichu bearings

🎨
Something custom

You explore flushmount or press-fit designs for unique setups

5
🛒 You gather your supplies

You order a pack of tiny ceramic ball bearings online and prepare your 3D printer with some plastic filament.

6
🖨️ You print and assemble

Your printer creates the bearing case, you drop in four small balls, and everything clicks together smoothly.

✨ Your trackball feels amazing

The ball glides silently with no sticking, and you saved money while helping the planet by printing instead of buying new parts.

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AI-Generated Review

What is semistatic-bearing?

This is a 3D printing project for trackball enthusiasts who want to upgrade or repair their pointing devices. The semistatic bearing is a hybrid design that combines a free-spinning main ball bearing with three stationary subbearings underneath, creating a smoother experience than traditional static bearings while avoiding the stiction problems of cheap ball transfer units. The project provides STL files for printing your own bearings, with models compatible with popular trackball brands like Ploopy, efog.tech, and Kensington. Each bearing requires four ball bearings and about a gram of filament to assemble.

Why is it gaining traction?

The economics are compelling. A complete semistatic bearing costs around $1.26 to produce, compared to $15-30+ for commercial ball transfer units from Bosch Rexroth. The design is also easy to disassemble for cleaning, which matters for bearings that see heavy daily use. The author provides multiple variants targeting different BTU form factors, plus spacer options for fine-tuning fit in various trackball housings. For the DIY crowd already running 3D printers, this fills a gap between budget solutions that feel sticky and premium commercial options that cost too much to experiment with.

Who should use this?

Trackball enthusiasts running 3D printers who want smoother action than stock bearings without spending $60+ on replacement BTUs. It's especially useful for modifying or repairing discontinued trackballs where replacement parts simply aren't available. If you travel with your trackball and want a spare set of bearings that won't fail under rough handling, this gives you an affordable option to keep on hand.

Verdict

This is a niche but well-documented project for a specific audience. With only 19 stars, the credibility score sits at 1.0%, reflecting its early-stage status and small community. The documentation is thorough for assembly and compatibility, but there's no automated testing infrastructure. If you fit the use case, the cost savings and design quality justify the project. Just understand you're relying on a solo maintainer for now.

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