A nice Mini Bic lighter sleeve, that feels very tactile. It has holes to attach paracord and when the lighter is reversed, the sleeve protects the gas lever from accidental discharge.
J25 is the official model number of the Mini Bic lighter.
Tolerances for a good fit are quite narrow. If it is hard to put in, leave it in there for a day and it might get easier due to creep. Or sand down the resistance spine inside the hole slightly. If that doesn't help, scale it a bit.
I used PETG on a Prusa and it fits without modification. Sanding it a bit gives it a used optic.
The author marked this model as their own original creation.