It sounds like you've made some thoughtful design improvements for the new SA sculptured PBT tooling! Shifting from ABS to PBT involves more than just material changes, especially given the different shrink rates and material behaviors, so having thick, uniform walls to control cooling and shrinkage will undoubtedly lead to a more consistent and durable product. The choice to add a fine matte finish is also a nice touch, as it will enhance scratch resistance and likely provide a premium feel without the added gloss of traditional ABS keycaps. April for first article testing is exciting! Once you have results, it would be interesting to see how the sublimation printing quality holds up on PBT with this new tooling, as that’s a big draw for enthusiasts seeking high-quality, long-lasting legends on keycaps.