3D model is ready for 3d print. The rear protective cover, for the Soviet lens - Helios 44-2. No screw-thread.

Print parameters to taste It is advisable to print with high accuracy (quality) so that the lid is tightly closed, my print parameters, thickness of the line - 0.2mm filling - 20%. In the FreeCAD program you can adjust the dimensions if necessary.

Real scale - Units: mm ~ 53.0 x 53.0 x 15.46 mm.

Formats:

• .FCStd (Mesh + drawing) FreeCad 0.19.
• .blend (Mesh + material (Principled BSDF) no textures ) - Blender (ver. 2.93.5).
• .stl (only mesh without materials). - exported from FreeCad.
• .FBX (only mesh without materials). - exported from Blender.
• .obj (Triangulated, only mesh without materials). - exported from FreeCad.
• .PDF (drawing). - exported from FreeCad.

Rendered in Blender Cycles.