smooth ashtray prototype 01

- this ashtray prototype is designed to check if internal part can be printed horizontally to ensure really tight fit without locking element inside

- prusa mini+ prints those parts correctly and ensures airtight fit

- this design should not only work smoothly but also don't make lound noises while opening the box (when both elements are printed vertically then there's loud "zzzit" noise made by layers grinding other layers)