an L39/M39 rear lens cap.
several versions, plain or with M39 text or old style mfr logos
Usually looks best printed face up, but that requires support.
alternatively, the "v1.1c" STL file does not include the "M39" text seen in the photo, it is flat, so the print may be made face down with no support.
I've found the threads print better without support (in FDM/PLA etc), those printed with support benefit from running a blade or small screwdriver around the threads to remove any small burrs that impede fitting to a lens.
*new logos added: Leica, Ross, Taylor Hobson, Wray
PLA: 20% infill or more recomended. Layer height .2mm or less.
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