Review: Wham Bam PEX vs Bambu Textured PEI Build Plates

Bambu Lab users face a straightforward choice when swapping build surfaces: stay with the stock textured PEI or try a third-party PEX plate from Wham Bam. The better option comes down to the filaments you print most, the finish you want on the bottom of parts, and how much maintenance you’re willing to do.

Material Composition and Construction

The Wham Bam PEX uses a 0.35 mm custom cross-linked polyethylene layer bonded with 3M adhesive to a 0.4 mm (or 0.6 mm XTR) high-chromium spring steel flex plate. That material lets the plate handle bed temperatures up to 180 °C.

The Bambu Textured PEI starts with a 0.075 mm PEI powder coat on a 0.4–0.5 mm magnetic stainless steel sheet. The texture comes straight from the powder-coating process.

Both plates use magnetic bases for fast swaps. The Wham Bam steel feels noticeably stiffer when you flex it, while Bambu’s plate prioritizes strong magnetic hold.

Compatibility and Sizing

Both options fit the same Bambu printers.

• Wham Bam PEX: 258 × 258 mm usable area on X1/P1 series machines; 184 × 184 mm for the A1 mini. One-sided only.
• Bambu Textured PEI: 256 × 256 mm on standard models; 180 × 180 mm on the mini. Some versions are dual-sided.

They drop straight onto the existing magnetic beds with no firmware changes or LiDAR issues.

Adhesion, Release, and Surface Finish

Wham Bam PEX gives glossy bottoms on PLA with almost no warping and releases easily once the bed cools. Many users print large flat parts without brims and get consistent results. PETG is trickier—it can bond permanently unless you use glue.

Bambu Textured PEI grips ABS, Nylon, PC, and other engineering filaments reliably. The textured surface hides small imperfections, but it needs thorough IPA cleaning between prints. Release is usually predictable after cooldown, though occasional scraper marks show up over time.

Pricing and Real-World Longevity

Current pricing (late 2024–2025) looks like this:

• Wham Bam PEX (Bambu-size flex plate): $39–$54; A1 mini version $22.99
• Bambu Textured PEI (official): $39.99

Wham Bam surfaces can last hundreds of hours with occasional steel wool refresh, though they wear faster with heavy PETG use. Bambu’s PEI coating holds up better against scrapers but rewards strict cleaning habits. Neither plate lasts forever.

“PEX gives me glossy PLA parts I don’t have to sand, but I keep the stock PEI installed for anything above 260 °C nozzle temps.” — aggregated Bambu forum consensus

Decision Framework

Go with the Wham Bam PEX if your workflow is mostly PLA and you want fast release plus glossy bottoms.
Stick with the Bambu Textured PEI if you regularly print ABS, Nylon, or PC and want one plate that covers the full range of materials.

A quick test helps: print a 200 mm square in PLA on each surface with no glue or brim. The plate that releases cleanly with zero warp is the winner for your setup.

flowchart TD
    A[Primary filament?] -->|Mostly PLA| B[Wham Bam PEX]
    A -->|ABS, Nylon, PC| C[Bambu Textured PEI]
    B --> D{Glossy bottom finish desired?}
    D -->|Yes| E[PEX wins]
    D -->|No| F[Test both]
    C --> G[Engineering filaments priority?]
    G -->|Yes| H[PEI wins]
    G -->|No| F

Conclusion

The Wham Bam PEX plate shines with PLA adhesion, easy release, and a glossy finish. The Bambu Textured PEI handles a wider range of engineering filaments at roughly the same price. Match the surface to the filament you use most instead of looking for one plate that does everything.