The file 'Durst C65 35mm Negative Holder 3D Printer Model' is (stl) file type, size is 25.6KB.
Use which ever print settings work best for you.
This is untested, so it might need tweaking to ensure things are centered.
Both parts will click together to give you the ability to print with a Durst C65 enlarger and others that use the same carrier style.
Durst_35mm_lower.stl | 75.9KB | |
Durst_35mm_upper.stl | 42.3KB |