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First ever cardboard box mod, anyone? Anyway, finally got my hands on a 18650 holder. Reused the kBox 510 but used 22awg wires this time round. Good thing about this is... can use penknife to make holes. If too small, just ram it in. Vapes like a charm.
Really really nice. Though I think the card board may disintegrate after exposure to moisture, juice and skin oils. Also for whatever reason, if the box collapses in your bag from being squash, you're in for a short and battery safety may be compromised. Please upgrade to a plastic case. You can get a simple one from SLT and using a solder iron you can melt the plastic to press fit all your parts.