Chai45G, a homebrew keyboard with a trackball in the center of the Grin array

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On March 9, 2024, Mr. Gohanda presented a new Chai45G prototype.

https://twitter.com/gohanda_kbd/status/1766386354932600976

The Chai45G is an all-in-one device with a 40% layout that uses the Grin layout invented by Mr. Policium and a 25mm trackball in the center of the keyboard.

The first appearance will be in January 2024.

It appears to have been developed in only 3 months, starting at the end of December 2023.

The series of production process is also introduced in the following post.

The prototype is priced at 20,500 yen (including tax) for matte black and 19,500 yen (including tax) for matte white, and soldering service is available if soldering is difficult.

Build guide is here ▷▷▷.

The RP2040 is surface-mounted, so no ProMicro is required, all keys are hot-swappable, and an acrylic laminate case is included.

The mounting system is the Tadpole mount used by Bully and others, so a soft keystroke feel can be expected.

The ball case 3D data and acrylic case data will be made available to purchasers, who will be able to order their own cases in their favorite colors after purchase.

If you are interested, why not tap the “Suki” button on the Booth page?

https://twitter.com/gohanda_kbd/status/1766386354932600976

BOOTH sales page is here ▷▷▷.

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Avatar of 河村 亮介 Ryosuke Kawamura Greenkeys chief editor

Ryosuke Kawamura is the Editor-in-Chief of Greenkeys and the founder of GreenEchoes Studio.

He covers mechanical keyboards, custom keyboards, and input devices through reviews, interviews, hands-on testing, photography, and editorial work. He has reviewed more than 100 products and regularly reports on JIS-layout compatibility and trends in the Japanese keyboard market.

He also founded the Japan Layout Alliance (JLA), an industry collaboration initiative aimed at improving compatibility for Japanese-layout keyboards.

Greenkeys values editorial independence and transparency. Product samples, advertising relationships, and affiliate links are disclosed within each article.

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