FM12 Gas Mask Lens Caps

thingiverse

Designed a few minutes creating custom covers for my FM12 gas mask lenses. Two versions were crafted, one rendering everything black and the other featuring pepper-pot holes. In actual use, I discovered that shaving one of the retaining tabs on the inside of the caps is necessary to prevent them from being extremely difficult to remove when no longer needed. Refactoring the design without the tabs would be too time-consuming, so this modification was implemented. On my printer, working with ABS material required increasing the size by 0.5% to compensate for shrinkage and achieve a snug fit between the caps and the mask. The covers were finished with multiple coats of Rustoleum rubberized undercoating to give them an appearance and texture distinct from standard FDM printed parts.