2 layers285 × 94.5 mm
Rmk ble keyboard
HaoboGu/rmk-ble-keyboard
A fully open source BLE/USB dual-mode GH60 keyboard powered by rmk
160 parts42GPL-3.0
2 layers87.6 × 92.3 mm
Slim diamond
rafaelromao/diamond16Diamond is a handwired board originally designed by me but heavily inspired by the Rommana and using the switch holders from the Dactyl Cygnus.
- Size
- 87.6 × 92.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 25
- Pads
- 212
- Tracks, vias
- 462, 205
- Pours
- 16
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 1 Mar 2025
- Updated
- 8 Nov 2026
Overview
Slim diamond is an open-source printed circuit board by rafaelromao, from the rafaelromao/diamond repository on GitHub. It is a 2-layer board of 87.6 × 92.3 mm with 34 parts on 25 nets, routed with 462 tracks and 205 vias.
It is built around the MSK-12C02. Its parts include 14 switches, 1 IC and 1 connector. It belongs with the nRF52 and nRF5x boards of this library.
Main components
1README
readme.mdDiamond
A 24 keys handwired split keyboard.
Diamond is a handwired board originally designed by me but heavily inspired by the Rommana and using the switch holders from the Dactyl Cygnus.
- It contains 24 keys only, in the format 1333+2.
- It should be handwired, ideally using single switch PCBs.
- The MCU, reset button and on/off switch goes in the base, below a cover used to hide them.
- These components should be mounted upside down, under this cover.
- The cables for column and rows will pass through holes or cutouts in the cover and can be tightened in the end of assembling to make them less visible in the final build.
Diamond Builds
Diamond
Wired Diamond
Choc Diamond
Slim Diamond
A wireless Choc version on a reversible PCB: XIAO nRF52840, 752025 battery, tented by the battery underneath, and magnets to join the halves or stack them back to back.
STL Files
The STL files are provided for the right side only. To print the left side you will have to mirror them.
- Base Right
- Cover Right
- Cover Right with Cutout
- MX Body Right
- MX Body Right - Tilted Thumbs
- Choc Body Right
- Choc Body Right - Tilted Thumbs
Slim Diamond
Both halves are provided, already oriented for printing: the bases floor-down, the plates top face down. See the build guide for the print settings.
Firmware
Check my keyboards repo to find the ZMK firmware for these boards.
Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | M3 | slim_diamond:MountingHole_M3 | H1, H2, H3, H4 |
| 1 | +MID BATM | slim_diamond:SolderJumper_B | JS3 |
| 1 | +MID BATM | slim_diamond:SolderJumper_F | JS1 |
| 1 | +MID BATU | slim_diamond:SolderJumper_B | JS4 |
| 1 | +MID BATU | slim_diamond:SolderJumper_F | JS2 |
| 1 | +USB BATM | slim_diamond:SolderJumper_B | JS7 |
| 1 | +USB BATM | slim_diamond:SolderJumper_F | JS5 |
| 1 | +USB BATU | slim_diamond:SolderJumper_B | JS8 |
| 1 | +USB BATU | slim_diamond:SolderJumper_F | JS6 |
| 1 | D0 left | slim_diamond:SolderJumper_F | JP1 |
| 1 | D0 right | slim_diamond:SolderJumper_B | JP14 |
| 1 | D1 left | slim_diamond:SolderJumper_F | JP2 |
| 1 | D1 right | slim_diamond:SolderJumper_B | JP13 |
| 1 | D2 left | slim_diamond:SolderJumper_F | JP3 |
| 1 | D2 right | slim_diamond:SolderJumper_B | JP12 |
| 1 | JST PH 2.0 battery | slim_diamond:JST_PH_S2B_Reversible | J1 |
| 1 | MSK-12C02 | slim_diamond:SW_MSK12C02_Reversible | SW13 |
| 1 | TS-1187A reset | slim_diamond:SW_TS1187A_Reversible | SW14 |
| 1 | XIAO nRF52840 / Super52840 | slim_diamond:nRF52840_Module_Reversible | U1 |
| 1 | index_bottom | slim_diamond:SW_Choc_V1_Hotswap_Reversible | SW10 |
| 1 | index_home | slim_diamond:SW_Choc_V1_Hotswap_Reversible | SW9 |
| 1 | index_top | slim_diamond:SW_Choc_V1_Hotswap_Reversible | SW8 |
| 1 | middle_bottom | slim_diamond:SW_Choc_V1_Hotswap_Reversible | SW7 |
| 1 | middle_home | slim_diamond:SW_Choc_V1_Hotswap_Reversible | SW6 |
| 1 | middle_top | slim_diamond:SW_Choc_V1_Hotswap_Reversible | SW5 |
| 1 | pinky | slim_diamond:SW_Choc_V1_Hotswap_Reversible | SW1 |
| 1 | ring_bottom | slim_diamond:SW_Choc_V1_Hotswap_Reversible | SW4 |
| 1 | ring_home | slim_diamond:SW_Choc_V1_Hotswap_Reversible | SW3 |
| 1 | ring_top | slim_diamond:SW_Choc_V1_Hotswap_Reversible | SW2 |
| 1 | thumb_inner | slim_diamond:SW_Choc_V1_Hotswap_Reversible | SW12 |
| 1 | thumb_outer | slim_diamond:SW_Choc_V1_Hotswap_Reversible | SW11 |
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Questions
How big is the Slim diamond PCB?
It measures 87.6 × 92.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Slim diamond use?
34 parts, built around the MSK-12C02. 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 Slim diamond KiCad files?
From the rafaelromao/diamond repository on GitHub, at the commit this page was made from: the board is slim_diamond/pcb/slim_diamond.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Slim diamond design in my own project?
Its repository states no licence, so its author keeps all rights: ask rafaelromao before reusing the design.