Parts List

This page lists every part needed for a complete PolyKybd Split72 build.

Required parts

PCBs

Part	Quantity	Notes
Left PCB (assembled, 4-layer, 1.6mm)	1	See PCB ordering
Right PCB (assembled, 4-layer, 1.6mm)	1	See PCB ordering

Mechanical

Part	Quantity	Notes
Left aluminum plate (1.2mm)	1	Order as 1.2mm aluminium PCB
Right aluminum plate (1.2mm)	1	Order as 1.2mm aluminium PCB
Left 3D-printed case	1	STL: case/case_polysplit72_left2_r4.stl
Right 3D-printed case	1	STL: case/case_polysplit72_right2_r4.stl
Spacer	2	STL: case/spacer.stl
M3×10 hex screws (rounded head)	8	—
M3 hex nuts	8	Required for case revision r4+

Note

If you use CNC aluminium cases instead of resin-printed ones, add threaded inserts to the screw holes. Resin prints accept M3 screws directly.

Tip

If a resin case is slightly warped, use a hair dryer to soften it, then press it flat under a heavy object — it really works.

Switches & keycaps

Part	Quantity	Notes
MX-compatible key switches	72	See Compatible Switches
3D-printed key stems (1U)	58	SLA print recommended
3D-printed key stems (1.25U)	14	SLA print recommended
Transparent relegendable keycap covers (1U)	58	e.g. AliExpress relegendable keycaps
Transparent relegendable keycap covers (1.25U)	14	—

Key stem profiles available: Flat (R3), Stepped (R2), or Curved (R1–R5). See the build guide for quantities per profile.

Displays

Part	Quantity	Notes
0.42” OLED displays with FPC	72	Must be 14-pin; see Displays & FPC Extension
0.96” status displays (FPW096W001Z0)	2	Optional; ~40mm FPC cable
Status display holder	2	STL: parts/display_holder_r1.stl
Dummy display holder (if no status display)	2	STL: parts/display_holder_dummy_r1.stl

Cables

Part	Quantity	Notes
Short USB-C to USB-C cable	1	~50cm, connects the two halves
USB-C to USB-A or USB-C cable	1	Connects to the host computer

Note

A USB-C to USB-A cable + USB-A to USB-C adapter combination only works in one orientation. Use a native USB-C to USB-C cable to avoid confusion.

Optional parts

Rotary encoder

Either of these fits the PCB footprint:

• EVQWGD001 — Note: remove the last pin before soldering. This encoder is no longer in production.
• Alps EC11 encoder

Pointing devices (choose one)

Option	Part	Notes
Trackball	Pimoroni Trackball	Solder header without the plastic distance holder
Trackpad (small)	Cirque TM023023-2024-002 (23mm)	Remove R1 on back to switch to I2C; needs 12-pin FPC ~50–70mm
Trackpad (large, experimental)	Cirque TM035035-2024-003 (35mm)	Modify OpenSCAD source before printing the holder

Only one pointing device can be installed per half.