Discussion and information about the group buy can be found in the
#p4kcr3 channel on the 40% Keyboards Discord server.
A new extra-flexy PCB - the Model-V - is available alongside P⁴KCR3 during the group buy.
P⁴KCR3 uses a simplified isolation mount design that relies on a pair of thick rubber gaskets to sandwich the PCB along the left and right edges. The case is designed to be used with plateless builds and is not compatible with standard MiniVan plates.
Prototype units provided no additional support to the middle of the PCB to offer the maximum amount of flex while typing. Most PCBs experienced issues with switch legs bottoming out on the inside of the case due to the lack of any support. Small blocks of gasket material were included with production units to allow end users to customize the board to their preference.
First rule of P⁴KCR3 is you do not talk about R1
Second rule of P⁴KCR3 is you do not talk about R2
21 full metal cases were produced prior to the round 3 group buy. Made from milled and mirror polished stainless steel, these cases featured angled sides with wider radiuses for the rounded top edges.
Round 3 cases are made with white or black milled POM tops and brass bottoms. The case has flat sides and smaller radiuses on the top edges compared to FE units, significantly reducing the cost of machining the tops. Cases are estimated to weigh ~2 pounds.