Bsun x Udon Linear Switches

This linear switch targets users who want a smooth keystroke with a distinct clacky sound at bottom out. It suits typists or gamers who prefer a tactilely consistent press without bumps but desire audible feedback beyond typical linear switches. The sound profile is sharper and fuller than many BSUN linears, making it less ideal for quiet environments.

Feel & Sound

• The stem uses Y3X material, softer and smoother than earlier LY and Y3 stems, providing a consistent, low-friction keypress.
• The modified PA66 bottom housing with fiberglass adds a firm, clacky bottom-out sound that is fuller and less thin than typical BSUN switches.
• The polycarbonate top housing creates a clean, sharp top-out sound, contributing to an overall crisp audio profile.
• It is one of the more clacky linear switches from BSUN, so it may not suit users seeking quiet operation.

Actuation Characteristics

• The switch actuates at a moderate force, offering a balance between lightness and resistance for controlled keypresses.
• Pre-travel and total travel distances support a smooth, linear motion without tactile bumps or clicks.
• Bottom-out force is slightly higher than actuation force, providing a noticeable but not harsh landing.

Build Quality & Lubrication

• Stem sliders are factory lubed with a thin coat of 205g0 grease to reduce friction without causing lube pooling, which can affect smoothness.
• Springs receive a dry film lube to minimize spring noise, known as spring ping.
• Housing materials combine polycarbonate (top) and PA66 with fiberglass (bottom) for durability and sound shaping.

Trade-offs

• The clacky sound profile may be disruptive in quiet settings.
• Lubrication is minimal to prevent pooling, so additional lubing may be needed for users seeking an even smoother feel.
• Unknown compatibility details and modification potential beyond factory lube.