Tier 1 · PLA
- Brass heat-set inserts
- No supports on the rail
- Reprint any part in an hour
LAGOS · rev B
One keyboard.
Every pointing device.
A 38-key split built on the TOTEM layout, with a slide-in bay right under your right thumb. Trackball, TrackPoint or touchpad: slide one in, feel the click, and point. Slide it out and keep typing.
One email when kits open. No spam. How the bay works →
- Hot-swappable attachments
- Socketed MCU
- Hot-swap switches
- PLA · PA-CF · 316L
EXPLORE IN 3D
Turn it over. Look closer.
Drag to orbit, pinch or scroll to zoom. This is the real CAD model, the same one that gets printed.
THE MITUS BAY
Slides like a controller. Clicks like a switch.
- 45° dovetail rail prints without supports, centres itself, and has no magnets to glue.
- Spring ball detent gives you a click you can feel, and the attachment stays put while you work.
- Six pogo pins with staggered gold contacts. Ground mates first and detect mates last, so the bay only powers up once everything is connected. Hot-plug at will.
- Open I2C protocol. Each attachment has its own RP2040 and identifies itself. Build your own: type IDs 0x10-0x7F are yours.
ATTACHMENTS
Pick your pointer. Change your mind later.
Trackball
34 mm ball on three steel bearings over a PMW3360 sensor. Two choc clicks.
TrackPoint
The red nub, salvaged from a Lenovo keyboard and mounted on an adapter plate. Three choc clicks, plus a scroll key on the mouse layer.
Touchpad
40 mm Cirque glass pad. Tap to click, two-finger tap to right-click, plus two choc clicks.
Blank cover
A flush cap for travel days. It is also the dovetail fit test you print first.
Every attachment also works on its own as a USB mouse: plug it into its USB-C port.
THREE TIERS · ONE GEOMETRY
Print it, upgrade it, or keep it for life.
Tier 2 · Nylon-Carbon
- Stiff, matte and heat-proof (~150 °C)
- Built for daily travel
- Same inserts and screws
Tier 3 · 316L Steel
- Tapped threads, no plastic
- Laser-cut 304 base plates
- A desk heirloom
The outside is identical in every tier, so any attachment fits any Lagos.
BUILT TO BE OPENED
Every wear part is a 5-minute swap.
| Dead key | Hot-swap switch | 1 min |
| Dead half | Socketed RP2040, unplug and replace | 5 min |
| Flaky bay | Pogo board drops out of its card slots | 10 min |
| Loose detent | Turn the M3 plunger ¼ turn | 2 min |
| Cracked shell | Reprint from the published STEP | 1 h |
No glue. No single-use clips. One hex key. All threads in brass or steel.
LAYOUT
38 keys, TOTEM geometry, a smarter mouse layer.
QMK with home-row mods. When the attachment moves, the home row turns into mouse buttons. Hold for scroll or precision. Each attachment gets its own RGB colour.
ELECTRONICS
Open hardware, down to the pins.
Right half + Mitus Bay. The left half is the same MCU and matrix, without the bay.
Right-half PCB, top: 19 hot-swap choc sockets, socketed RP2040-Zero, TRRS. Placement is DRC clean; routing in progress.
Right-half PCB, bottom.
Left-half PCB, top: a mirror of the right, without the bay.
MINOS
Already have a TOTEM? Give it a real case.
Minos is our three-tier case for the stock TOTEM v0.3 PCB: same standoffs, same repair-first hardware, and the same PLA / nylon-carbon / steel choice. It drops onto the board you already built. No new electronics.
SPECS
Lagos rev B
- Keys
- 38 (3×5 + 1 + 3 per side), Kailh Choc v1 hot-swap
- Controller
- RP2040-Zero per half, socketed
- Firmware
- QMK (open source), Mitus Bay pointing driver
- Connection
- USB-C (either half) · TRRS between halves
- Bay
- Dovetail + detent · 6-pin pogo · I2C 400 kHz · hot-plug
- Height
- 12.6 mm case · low profile
- Hardware
- M2 throughout · M3 detent
- Heritage
- Key geometry from TOTEM by GEIST (CERN-OHL-P)
First kits ship in small batches.
Prototypes are being built now. Get one email when kits open, with no spam.