Leica 15mm 1.7 Lens Cap

The original Lens Cap for my Panasonic Leica 15mm was way too loose and always fell off when carried in a Bag or Backpack. So I designed one that's a bit more Snug.

I'm quite sure this only works with a flexible Filament, as it is pretty snug! I usually use Filaflex for this. (pretty flexible TPU)