2 layers207.5 × 100.9 mm
2 layers102.5 × 100.9 mm
A ergonomical splitkbd!
- Size
- 102.5 × 100.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 49
- Nets
- 39
- Pads
- 191
- Tracks, vias
- 242, 37
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 8 Mar 2026
- Updated
- 14 May 2026
Overview
Left is an open-source printed circuit board by sudo-apt-install-tap, from the sudo-apt-install-tap/ErgoSplit repository on GitHub. It is a 2-layer board of 102.5 × 100.9 mm with 49 parts on 39 nets, routed with 242 tracks and 37 vias.
Its parts include 18 diodes, 18 switches and 1 IC. It belongs with the nRF52 and nRF5x boards of this library.
README
README.mdErgoSplit
A low-profile split-keyboard!
Overview
A split keyboard with a minimalist low profile design!! Symmetrical for easy printing.
Why?
I wanted a split keyboard thats low profile and looks cool
How?
Use the firmware in FIRMWARE . I've used circuitpy and kmk to do it!
CAD
CAD files are available at CAD
Images
Full render
PCB
Left Sch
Right Sch
Build Images
Left Build!
Right Build!
Togather!
VIDEO
BOM
| Name | Quantity | Price ( 1 UNIT) | Price Total | Runing Total | Link |
|---|---|---|---|---|---|
| MCU | 2 | ₹1,160.00 | ₹2,320.00 | ₹2,320.00 | https://robu.in/product/seeed-studio-xiao-ble-nrf52840/ |
| DIODES | 40 | ₹1.05 | ₹42.00 | ₹2,362.00 | https://robu.in/product/mm1z27-slkor-sod-123-zener-diodes-rohs/ |
| Hotswap Socket (Pack of 10) | 4 | 145 | ₹580.00 | ₹2,942.00 | https://neomacro.in/products/kailh-choc-pg1350-hot-swap-sockets?variant=48049369907478 |
| Kailh Choc V1 (Pack of 10) | 4 | ₹480.00 | ₹1,920.00 | ₹4,862.00 | https://neomacro.in/products/kailh-choc-v1-switches?variant=48049336025366 |
| Keycaps 1U (Pack of 10) | 4 | ₹350.00 | ₹1,400.00 | ₹6,262.00 | https://neomacro.in/products/chocfox-cfx-choc-blank-keycaps?variant=50664114913558 |
| Homing Keys (Pack of 2) | 1 | ₹70.00 | ₹70.00 | ₹6,332.00 | https://neomacro.in/products/chocfox-cfx-choc-blank-keycaps?variant=48049351590166 |
| PCB | 5 | ₹470.00 | ₹2,350.00 | ₹8,682.00 | https://jlcpcb.com/ |
| Total | --- | --- | --- | ₹8,682.00 | --- |
| Round off total ~ 8.75k INR |
Total: $95
Print Legion Shipping: $5
Grand Total: $100
Parts
49| Qty | Value | Footprint | References |
|---|---|---|---|
| 18 | D | Diode_SMD:D_SOD-123 | D19, D20, D21, D22, D23, D24, D25, D26, D27, D28, D29, D30, D31, D32, D33, D34 +2 |
| 18 | SW_Push_45deg | KEYS:SW_Hotswap_Kailh_Choc_V1 | SW19, SW20, SW21, SW22, SW23, SW24, SW25, SW26, SW27, SW28, SW29, SW30, SW31, SW32, SW33, SW34 +2 |
| 5 | LOGO | LOGO | G***, G***, G***, G***, G*** |
| 5 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4, H9 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D2.0mm | Bat -, Bat + |
| 1 | XIAO-nRF52840-SMD | XIAO BATSS:XIAO-nRF52840-SMD | U3 |
Questions
How big is the Left PCB?
It measures 102.5 × 100.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Left use?
49 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Left KiCad files?
From the sudo-apt-install-tap/ErgoSplit repository on GitHub, at the commit this page was made from: the board is KiCAD/Halfs/Left/Left.kicad_pcb and its schematic KiCAD/KiCAD.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Left design in my own project?
Its repository states no licence, so its author keeps all rights: ask sudo-apt-install-tap before reusing the design.
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