Honeycomb Killflash for 21 mm scopes/thermal cameras.
The inner diameter of the killflash is 21.4mm, so it should fit
The holes are just 6mm in diameter to ensure that a bb can not pas trough and still ensure the best visibility.

There are 3 versions:
-normal version with 1mm wide walls for the honeycomb pattern

-slim version with 0.5mm wals

-slim version with more material to attach the honeycomb to the edges

Print settings:
Disable “detect thin walls”

0.2mm layer height

Materia: PLA +