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Head to head · Prices checked Nov 11, 2026

sam Notfromsam S46 R3 vs MMD KM40

Get the MMD KM40 for qmk and usb-c.

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What actually differs

The differences that matter

Skip the 40-row spec sheet. These are the specs that change how each board feels, sounds, and fits your desk.

sam Notfromsam S46 R3

MMD KM40

  • Case material

    Aluminum, Copper, Polycarbonate

    Aluminum

  • Mount style

    Top Mount

    Gasket Mount

  • Weight

    600 g

    620 g

    Heavier boards stay planted and lighter ones travel

  • QMK

    No

    Yes

    The deep option when you want to remap every key

  • USB-C

    No

    Yes

KeebFinder scores

How we score
  • sam Notfromsam S46 R3
  • MMD KM40
Performance
62
60
Build quality
82
82
Productivity
60
69
Customizability
79
83
Portability
80
84

What they share

  • Layout size: 40%
  • Connection: Bluetooth, 2.4 GHz, Wired
  • Hot-swappable
  • VIA
  • Sound dampening
  • Plate material: Polycarbonate
See every spec side by side

Full specs

sam Notfromsam S46 R3 vs MMD KM40 specs

Every tracked spec, side by side. Rows marked with a dot differ between the boards.

5 of 21 specs differ

sam Notfromsam S46 R3

MMD KM40

Typing & switches

Switch options

—
Linear, Tactile

Hot-swappable

Yes
Yes

Mount style

Top Mount
Gasket Mount

Sound dampening

Yes
Yes

Layout

Layout size

40%
40%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Display

None
None

Connectivity & battery

Connection

Bluetooth, 2.4 GHz, Wired
Bluetooth, 2.4 GHz, Wired

Battery

—
2,000 mAh

USB-C

No
Yes

Build & materials

Case material

Aluminum, Copper, Polycarbonate
Aluminum

Plate material

Polycarbonate
Polycarbonate

Keycaps

—
PBT

Weight

600 g
620 g

Dimensions

28 x 264 x 98 mm
—

Typing angle

7°
—

Backlight

RGB
RGB

Firmware & software

QMK

No
Yes

VIA

Yes
Yes

Extras

Released

2026
2026

Where to buy

Compare prices

Live prices from the stores we track, cheapest in-stock offer first.

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MMD KM402 stores

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