What is SpaceFN and why you should give it a try
The SpaceFN concept - setting up your space key as a layer switch when held - is probably one of the most useful tweaks in the keyboard hobby. Let me explain how it works. My SpaceFN article on kbd.news made some rounds recently - quite surprisingly given the age of this concept. This piece you're reading is a condensed version of the full post. If you're left with unanswered questions, you'll most likely find the info you're looking for in the original write-up. On my imaginary top list of the most useful keyboard features, tweaks and hacks, SpaceFN would deserve a podium finish for sure. But what makes it so special? In short: SpaceFN is easy to implement, easy to learn, costs nothing, can be used with any keyboard, and can improve your productivity instantly. I will list its benefits below, but can state right at this point that the SpaceFN concept, setting up your space key as a layer switch when held, is clearly one of the most useful tweaks in the keyboard hobby....
Apr 30, 2024
Actually I've found the answer myself. http://support.wasdkeyboards.com/customer/portal/articles/1438513-wasd-v2-vs-code I am a bit surprised that WASD V2 is only of single layer PCB. I am not sure what exactly single/dual layer means, but I've heard FILCO uses dual layers and claims to be the best PCB in mechanical keyboard filed.
The material of the pcb, thickness, circuit design and and production process is a what matters on a keyboard pcb.
Note: I do not have any pcb related education. I just like electronics and have it as a hobby.