The file 'Camera Lens Cap Holder Canon 52-58mm 3D Printer Model' is (stl) file type, size is 60.6KB.
Camera Lens Cap HolderCanon EF 40mm f/2.8 stm (52mm)Canon EF-S 18-55mm f/3.5-5.6 (58mm)
http://shu-fan.blogspot.tw/2016/10/3d-52-58mm.html