Krokus enlarger lens holder rings/adapters

“krokus_flat_m39_mount” allows mounting an M39 lens directly on the enlarger. It is flat to allow a broader focusing range for 105mm lenses. You will need a recessed lens board for shorter lenses.

I designed “krokus_recessed_m25_mount” specifically to use an old Durst Componon 80mm lens. This has a pretty unusual M25 mount for which adapters are rarer than adapters for M39. It is slightly recessed like the original Krokus adapters made for 80mm lenses. It should also be suitable for normal use with other focal lengths.

You can always ask me if you need variations of this design for other lenses ! I only made these two so far because these are the only ones I needed.

Printing instructions :

• use black filament (I used PLA because that's only type I use but other types should work fine), the more opaque the better but it is designed rather thick to help with that
• files are already in the right orientation for printing, or at least that's how I printed them
• supports needed for the recessed version but not for the flat one
• I used cubic infill at 30% density to help with opacity and rigidity
• I used four wall lines and six top and bottom layers, again for opacity and rigidity
• 0.16mm layer height should be good enough for screw mounts to work, I didn't try higher layers
• no brim needed if you have good bed adhesion

Those are my very first models made from scratch so excuse me if the design is a bit rough.