Keyboard Builders' Digest
Save 5% at Divinikey! Code: KBDNEWS
Keyboard Builders' Digest / Projects


Infernum is a sub-40% keyboard with Katana layout – designed by Hai_Zeus.
Published September 9, 2022
Creators! Feel free to tip me off about your keyboard related projects to bring them to 120K readers.

The Infernum, this sub-40% monoblock split(?) by Hai_Zeus (top photo by wayduh) features the long-time not seen Katana layout.

Here goes a little sneak peek on a project I've been working on. It's a katana stagger sub 40% keyboard running on Vial-QMK – Hai_Zeus.

Katana was a family of keyboards designed by RominRonin back in 2016/17 in the picturesque Vienna – so it's not authentic Japanese despite the name choice. Most notable of the various versions is probably Katana60 which went into production and is still available e.g. here.

For those who are not familiar with this arrangement, it's a horizontally staggered layout but symmetric at the same time. Somewhat confusing to write about because the halves are not angled (horizontal rows) but you hold your forearm at an angle, wrist extension is alleviated.

Many years ago, as a noob in custom mechanical keyboards, Katana was one of the first layouts that actually made sense to me.

Anyway, Hai_Zeus came up with something similar on a 30-40% scale: ditching some keys, especially the number row and the hard-to-reach middle ones, and putting the ambiguous inverted cross symbol there – probably that's why wayduh chose the leviathan cross to make things clear. :D

The current design is Pro Micro based with a 3D printed case, but the author's plans are an integrated PCB running on an RP2040 microcontroller and milled acrylic or aluminum case.

Do you like this post? Share, donate, subscribe, tip me off!

Published on Fri 9th Sep 2022. Featured in KBD #94 (source).


Kolibri keyboard

The Kolibri is an Alice style design by kreme11 with open-source case.

Low profile barobord

The low profile version of sadekbaroudi's barobord was added to the repo.

SpUnLy58 1.2

Giraffasax updated the SpUnly58. Iteration V1.2 of this monoblock split comes with adjusted spacing, splay, and stagger.


An angled monoblock Pico-based keyboard from Optionally low-profile and open-source.


I just rediscovered the eek! by Klackygears, this unibody split with brutal 90 degree angle.

Chouchou keyboard

Dane Lipscombe published his Chouchou, a minimalist monoblock split designed to be used with the Taipo chording system.