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Building a Mechanical Keyboard: Switches and Keycaps Guide

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This guide will cover the fundamental components of a mechanical keyboard build: switches and keycaps. Understanding these elements is crucial for selecting components that align with your typing preferences and aesthetic goals.

Switches: The Heart of the Keyboard

Mechanical keyboard switches are the individual mechanisms under each keycap that register keystrokes. They determine the tactile feel, audible feedback, and actuation force required to press a key. Unlike the rubber dome switches found in most membrane keyboards, mechanical switches utilize a physical mechanism, typically involving a spring and a stem. This design offers greater durability, precision, and a customizable typing experience.

Types of Mechanical Switches

Mechanical switches are broadly categorized into three main types: Linear, Tactile, and Clicky. This classification is based on the sensation and sound produced when a key is actuated.

Linear Switches

Linear switches offer a smooth and consistent keystroke from top to bottom. There is no tactile bump or audible click to signal actuation. The keypress feels like pressing through a spring.

  • Characteristics: Smooth travel, consistent resistance throughout the press, quiet operation (relative to tactile and clicky switches).
  • Mechanism: The stem moves directly down without encountering any obstructions. The resistance typically increases linearly as the spring is compressed.
  • Applications: Ideal for users who prioritize speed and a fluid typing experience. They are often favored by gamers who need rapid, repeated key presses without interruption. Writers who prefer a less intrusive typing sound may also find them suitable.
  • Examples: Cherry MX Red, Gateron Red, Kailh Red. These switches are characterized by their red stem color. Variations exist with different actuation forces.
Tactile Switches

Tactile switches provide a noticeable “bump” or feedback sensation at the point of actuation. This bump informs the user that the keypress has been registered, without necessarily producing an audible click.

  • Characteristics: A discernible bump during the keypress, moderate operational noise (without a click).
  • Mechanism: The stem, as it moves down, encounters a small projection or a shaped piece within the switch housing. This causes a momentary increase in resistance, which the user perceives as a tactile bump.
  • Applications: A popular choice for general typing and productivity. The tactile feedback can help reduce errors by confirming actuation, making it suitable for extended writing sessions. Many users find the feedback to be satisfying and conducive to a more deliberate typing rhythm.
  • Examples: Cherry MX Brown, Gateron Brown, Kailh Brown. These switches commonly feature brown stems. The tactility can vary in intensity and sharpness.
Clicky Switches

Clicky switches are characterized by both a tactile bump and an audible “click” sound at the point of actuation. This combination provides the most pronounced feedback for users.

  • Characteristics: A distinct tactile bump and a sharp audible click sound during actuation.
  • Mechanism: Similar to tactile switches, they have a mechanism that creates a tactile bump. However, this bump is often designed to be more pronounced and to simultaneously release a detent mechanism that produces the audible click.
  • Applications: Favored by users who enjoy a pronounced auditory and tactile response. Many find the feedback to be highly satisfying and to enhance their typing experience. However, the loudness of clicky switches can be a consideration in shared or quiet environments.
  • Examples: Cherry MX Blue, Gateron Blue, Kailh White. These switches frequently have blue or white stems. The loudness and tone of the click can vary between manufacturers and specific switch models.

Switch Specifications

Beyond the general categories, several specifications help differentiate switches:

  • Actuation Force: The amount of force, measured in centiNewtons (cN) or grams (g), required to press the switch down to the point of actuation. Lower actuation forces require less effort, while higher forces provide more resistance. Think of it as the “weight” of the keypress. A lighter switch feels effortless, while a heavier switch offers a more substantial press.
  • Light Actuation (35-50 cN): Suitable for rapid typing and gaming where minimizing fatigue is important.
  • Medium Actuation (50-65 cN): A common range that balances responsiveness and a sense of grounding.
  • Heavy Actuation (65+ cN): Provides a deliberate feel and can help prevent accidental presses.
  • Pre-travel: The distance the stem travels before actuation occurs. A shorter pre-travel means the key registers slightly faster.
  • Short Pre-travel (e.g., 1.2mm): Leads to quicker actuation.
  • Standard Pre-travel (e.g., 2.0mm): A common and balanced distance.
  • Total Travel: The total distance the stem travels from its resting position to being fully depressed.
  • Actuation Point: The specific distance from the top of the keycap travel where the switch registers a keystroke. This is often closely related to pre-travel.
  • Spring Type: The material and design of the spring influence the force curve and feel of the switch. Some springs are linear, meaning resistance increases steadily. Others are progressive, with resistance increasing more rapidly towards the bottom, or even unique designs like “complex” springs that offer more nuanced resistance profiles.
  • Materials: The housing, stem, and spring materials can affect the feel, sound, and durability of a switch. Common materials include polycarbonate, nylon, POM, and various metal alloys for springs. For instance, a stiffer spring might feel more resistant, akin to pushing against a taut rubber band.

Popular Switch Brands and Manufacturers

Several manufacturers produce mechanical keyboard switches, each with their own reputation for quality, feel, and innovation.

  • Cherry: The originator of many modern mechanical switch designs, particularly the MX series. Known for their longevity and consistent quality, though sometimes perceived as more expensive.
  • Gateron: A popular alternative to Cherry, often offering a smoother feel at a more accessible price point. They have a wide range of switch offerings.
  • Kailh: Another significant player, known for their innovative switch designs, including low-profile switches and switches with unique click mechanisms.
  • Outemu: Often found in entry-level mechanical keyboards, Outemu switches offer a budget-friendly option with a decent typing experience.
  • NovelKeys (NK_): While primarily a retailer, they collaborate with manufacturers and offer their own branded switches, often with unique characteristics and colorways.
  • Wuque Studio (WS): A newer entrant gaining popularity for their refined switch designs, often focusing on smoothness and sound.

Lubing and Filming Switches

For enthusiasts seeking to optimize their switch performance, lubing and filming are common modifications.

Lubing

Lubing involves applying a small amount of specialized lubricant to the internal moving parts of the switch, primarily the stem and housing.

  • Purpose: Reduces friction between the stem and housing, leading to a smoother keystroke, a more pleasant sound profile, and can mitigate scratchiness. It can be likened to oiling a well-worn hinge to make it move silently.
  • Lubricants: Common lubricants include Krytox 205g0 (for linear and tactile switches) and Tribosys 3204 or 3203 (for tactile switches where preserving tactility is crucial). Different lubricants have different viscosities and can alter the sound and feel.
  • Application Methods: Lubing can be done with a small brush or a syringe, carefully applying tiny amounts to specific contact points within the switch. Over-lubing can make the switch feel mushy or slow.
Filming

Switch films are thin plastic or rubber pieces that are placed between the top and bottom housing of a switch.

  • Purpose: Reduces housing wobble, which can lead to a more solid and consistent sound profile, often diminishing unwanted creaking or rattling. It acts like a gasket, cushioning the connection between the two halves of the switch.
  • Materials: Films are typically made from PET, polycarbonate, or POM.
  • Application: They are inserted during the process of opening and reassembling the switch.

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Keycaps: The Visible Interface

Keycaps are the plastic tops that you press. They are the most visible element of a keyboard and offer a significant opportunity for customization in terms of aesthetics and feel. They are the “skin” of your keyboard, dictating its visual personality.

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Keycap Materials

The material of a keycap impacts its durability, texture, sound, and overall feel.

  • ABS (Acrylonitrile Butadiene Styrene):
  • Characteristics: A common and affordable plastic. ABS keycaps can develop a shine over time with use as the surface wears down. They tend to produce a sharper, higher-pitched sound.
  • Pros: Lightweight, wide variety of colors and designs available, cost-effective.
  • Cons: Prone to developing a sheen (“shininess”) with use, can feel slightly slick over time.
  • PBT (Polybutylene Terephthalate):
  • Characteristics: A more durable and premium plastic. PBT keycaps have a naturally textured, matte finish that resists shine and wear. They generally produce a deeper, more muted sound profile compared to ABS.
  • Pros: Highly durable, resistant to shine, pleasant textured feel, good sound dampening.
  • Cons: More expensive than ABS, can be slightly harder to find in extremely vibrant or multi-colored designs compared to ABS.
  • POM (Polyoxymethylene):
  • Characteristics: Another durable plastic, often used for its smooth, almost “self-lubricating” feel. POM keycaps have a unique smooth texture that is distinct from both ABS and PBT. They can produce a deep, resonant sound.
  • Pros: Very durable, smooth texture, good sound characteristics.
  • Cons: Less common than ABS or PBT, can be more expensive.

Keycap Profiles

Keycap profile refers to the shape and height of the keycaps. Different profiles can significantly alter typing ergonomics and feel. Profiles are often sculpted, meaning each row has a different angle and height, creating a comfortable typing slope.

  • OEM Profile:
  • Characteristics: A tall, sculpted profile commonly found on many pre-built mechanical keyboards. It offers a familiar ergonomic design.
  • Pros: Widely available, comfortable for many users due to its commonality.
  • Cons: Can be perceived as too tall by some, less common in enthusiast kits compared to SA or Cherry.
  • Cherry Profile:
  • Characteristics: A sculpted profile that is slightly shorter and less aggressive than OEM. It’s a very popular choice in the enthusiast community for its balanced feel and ergonomics.
  • Pros: Comfortable for extended typing, good ergonomics, widely available in high-quality sets.
  • Cons: Might feel too low for users accustomed to taller profiles.
  • SA Profile:
  • Characteristics: A very tall, spherical, sculpted profile. SA keycaps offer a retro look and a distinctive typing feel due to their height and deep dished tops.
  • Pros: Unique aesthetic, satisfying typing experience for those who prefer tall keycaps.
  • Cons: Can feel “too tall” for some, may require an adjustment period, can be more prone to finger fatigue for some users.
  • DSA Profile:
  • Characteristics: A uniform, low-profile, spherical keycap. Unlike most sculpted profiles, all keys in a DSA set are the same height, offering a flat typing surface.
  • Pros: Uniform feel across the keyboard, can be user-friendly for those who want consistency.
  • Cons: Lacks the ergonomic slope of sculpted profiles, might not be as comfortable for extensive typing for everyone.
  • XDA Profile:
  • Characteristics: Similar to DSA in being uniform height but with a wider surface area and a slightly more rounded top. XDA offers a flat typing plane with a larger keycap “face.”
  • Pros: Uniformity, larger surface area for keypresses.
  • Cons: Lacks sculptural ergonomics, can feel monotonous to some.
  • KAT Profile:
  • Characteristics: A relatively newer profile that aims to offer a balance between Cherry and SA, with a sculpted design and a lower height than SA but a more pronounced sculpt than Cherry.
  • Pros: Offers a middle ground in terms of height and sculpt, often praised for its sound.
  • Cons: Less widely available than established profiles.
  • MT3 Profile:
  • Characteristics: A sculpted profile designed with retro keyboards in mind. It features deep, scooped keycaps and a significant sculpted feel, offering a distinct typing experience.
  • Pros: Unique aesthetic and tactile feel, inspired by vintage keyboards.
  • Cons: Its distinct sculpt may not suit all preferences.

Keycap Legends (Legends)

Legends are the characters or symbols printed or molded onto the top of a keycap. The method of legend creation impacts durability and appearance.

  • Dye-Sublimation (Dye-Sub):
  • Process: Ink is permanently dyed into the plastic of the keycap.
  • Pros: Legends are very durable and will not wear off. Allows for complex designs and multiple colors.
  • Cons: Typically done on PBT keycaps. The legend is only on the surface, so the texture of the keycap remains consistent.
  • Double-Shot:
  • Process: Two different colors of plastic are molded together. One piece forms the legend, and another forms the body of the keycap.
  • Pros: Legends are extremely durable and will never fade or wear off. The legend is essentially part of the keycap’s structure.
  • Cons: Can be more expensive. Typically found on ABS or PBT keycaps.
  • Laser Etching:
  • Process: A laser burns the legend into the surface of the keycap. Often filled with paint.
  • Pros: Allows for intricate designs.
  • Cons: Legends can wear off over time, especially with heavy use. The paint fill can fade or chip.
  • Pad Printing:
  • Process: Ink is applied to the surface of the keycap using a printing pad.
  • Pros: Cost-effective, allows for a wide range of colors.
  • Cons: Least durable method; legends are prone to wearing off quickly.

Keycap Modifiers and Layouts

When choosing keycaps, consider the layout of your keyboard. Different layouts have different numbers and sizes of keys, particularly on the modifier keys (Shift, Ctrl, Alt, Enter, Spacebar).

  • ANSI (American National Standards Institute): The most common layout in North America, featuring a long, horizontal Enter key and a shorter, vertical Backspace key.
  • ISO (International Organization for Standardization): Common in Europe, featuring a large, L-shaped Enter key and a shorter Left Shift key.
  • Modifier Key Sizes: Pay attention to the sizes of keys like Backspace, Left Shift, Right Shift, Ctrl, Alt, and the Spacebar. Some keycap sets only include standard sizes, while others offer a variety of options to accommodate different layouts. A “base kit” usually covers standard ANSI layouts, while additional kits might be needed for ISO or compact layouts like 60% or 75%.

Customizing with Keycaps

The vast array of keycap sets available allows for extensive personalization. Beyond aesthetics, the texture and profile of keycaps can significantly influence typing comfort and speed. Experimenting with different materials and profiles is a key part of the mechanical keyboard hobby.

This guide provides a foundation for understanding the essential components of switches and keycaps. The interplay between these two elements forms the core of your mechanical keyboard experience, shaping its feel, sound, and visual identity.

FAQs

What are mechanical keyboard switches?

Mechanical keyboard switches are individual components underneath each keycap that register a keystroke when pressed. They are known for their durability, tactile feedback, and customizable actuation force.

What are the different types of mechanical keyboard switches?

There are several types of mechanical keyboard switches, including linear switches (smooth keystrokes with no tactile bump), tactile switches (provide a noticeable bump when pressed), and clicky switches (audible click sound when pressed).

How do keycaps affect the typing experience?

Keycaps can affect the typing experience by influencing the sound, feel, and overall aesthetics of the keyboard. Different materials, profiles, and textures can impact the overall typing experience.

What are the most common keycap materials?

The most common keycap materials include ABS (acrylonitrile butadiene styrene) and PBT (polybutylene terephthalate). ABS keycaps are known for their smooth texture, while PBT keycaps are more durable and resistant to shine from prolonged use.

How can I choose the right switches and keycaps for my mechanical keyboard?

Choosing the right switches and keycaps depends on personal preference and typing style. It’s important to consider factors such as typing feel, sound, and durability when selecting switches and keycaps for a mechanical keyboard.

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