The Opti Naked Xcut is a Mech Boro Box from Optimist Mods out of Poland. This one is very similar to the Naked, but is a tad smaller and has different cutouts. It is 3d printed from Nylon PA12. It’s a full mech with silver contacts. The Naked XCut maybe might be the smallest of 18650 on market right now.
RRP: from 179€ – full custom possible.
The way to get these is in their Facebook group only. They use FedEx for shipping for the most part.