MMD Vivian Linear Switches

The MMD Vivian is a linear mechanical switch suited for users who prefer a smooth keystroke with a deep, thocky sound. It fits typists or gamers who want a quieter, cushioned bottom-out feel combined with a distinct clacky note. The switch balances sound character and durability through its unique materials, making it a choice for those interested in sound profile without sacrificing stem strength.

Feel & Sound

• The switch provides a smooth linear feel with no tactile bump or click.
• Its modified UPE stem offers softness that produces a deep, thocky sound, often favored for quieter typing.
• The bottom housing made of modified PUM adds a deeper clacky note on bottom-out, giving a layered sound profile.
• Users can expect a cushioned bottom-out due to the stem material’s softness, reducing finger fatigue during long sessions.

Actuation Characteristics

• The actuation force is moderate, requiring 53g to register a keypress, which suits users who want a balance between light and firm feedback.
• Pre-travel of 2.0mm and total travel of 3.6mm provide a standard keystroke distance common in many linear switches.
• Bottom-out force is slightly higher at 60g, contributing to a solid feel when fully pressed.

Build Quality

• The stem uses strengthened UPE, a modified soft plastic designed to maintain smoothness and sound while improving durability over standard UPE, which can break easily.
• The top housing is made of PA12, a common nylon material known for stability and consistent performance.
• The bottom housing’s modified PUM material is less common and contributes to the unique sound profile, though its long-term durability is unknown.

Trade-offs

• The softness of the stem improves sound and smoothness but may still be less durable than harder plastics used in other switches.
• The deeper clacky sound may not suit users seeking a very quiet or muted typing experience.
• Unknown factors include factory lubrication quality and long-term wear characteristics of the modified materials.