R2 with some cosmetic and material changes.
The vFLAT version features a massive 9.7mm pre tinned positive contact
We sought permission from evolv to use key parts of their open source reference 510 connector to base our new 510 design on. While they look similar from the outside the changes are significant enough for none of the parts to be compatible between connectors so please don't buy these to transplant parts. At best just the nut and solder lug will be compatible but there's no guarantee.
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For those of you 3d printing or designing enclosures we're providing basic CAD models. Some may require you to right click and select save as.