We've covered the basics of custom mechanical keyboards and building one from scratch. Once assembled, fine-tuning for perfection is next—with stabilizer and switch mods already detailed. Now, elevate your build further by optimizing the case and plate. Read our foundational guides for key terminology and concepts.
High-quality CNC-milled aluminum or brass cases are accessible and transform your keyboard into a true percussion instrument. Their hollow design amplifies key snaps, which is why enthusiasts obsess over sound profiles.
This matters most for premium metal cases, which ring with a thin, hollow pitch without treatment. Our proven method acoustically dampens both case and plate, delivering a richer, more satisfying typing sound.
A keyboard's metallic ring often stems from the plate vibrating on keystrokes, amplified by the 3.5mm PCB-plate gap acting as a resonance chamber. We'll fill it with damping material—like EVA foam—to mute vibrations, letting switch sounds shine cleanly.
1. Measure the case dimensions first, regardless of mount style (tray, sandwich, etc.). The foam must extend beyond the plate for an airtight seal against the case, minimizing noise leaks. EVA foam is forgiving—add 1mm if needed and trim later.
2. Transfer measurements to EVA foam. Stack two 2mm sheets or 3mm + 1mm for 3.5mm+ thickness (extra aids damping). Secure with double-sided tape or foam-safe glue before cutting.
3. Trace the plate onto foam with a fine scoring tool, staying near edges for precision.
4. Cut with a sharp blade for clean switch holes and features. For tray mounts, use a hole punch for screw posts—blades work but lack precision.
5. Adjust for stabilizer clearance as needed.
6. Solder switches to the PCB (see our switch soldering guide), then assemble PCB to plate.
Case treatment is simpler: line internals with foam to block noise transmission from dense metal. Methods vary slightly by mount—review our keyboard basics guide if needed.
1. Calculate floor-to-PCB clearance. For tray mounts: post height minus tallest bottom PCB component (e.g., 3.2mm post - 1mm component = 2mm foam). For others: case floor-to-plate distance minus (3.5mm gap + PCB thickness + tallest component), e.g., 10mm - (3.5 + 2 + 1.5) = 3mm foam.
2. Cut foam to case dimensions. Tray mounts need post holes and USB cutouts.
3. Fill hollow sections with matching-depth foam.
4. Line sides with 1-2mm thick strips (width = plate-to-floor distance). Leave gaps for posts in top/bottom, gasket, or sandwich mounts.
Assemble and enjoy the transformed sound—deeper, more refined, and professional-grade.
