I have Durst 600 and no plans to upgrade the enlarge. So, I am thinking to contact print 6x9(Agfa record) or 6x12(I do not have any camera yet in this format) like in the attached drawing.
May I know is there any mask available to acheive something with accurate spacing and so on? My skills are rather limited to go DIY way...
Have you considered going to a framing shop and having a piece of mat board cut to your specifications? Of course in this situation you would want to tell them that it is vital that the cuts be made as straight and clean as possible. Just an idea.
One suggestion is to try making masks out of thin brass shim stock, available at many hardware or modeling stores, before going with 3-D printing. You should be able to find some that is just thin enough to lie flat and can then use the negatives to align the pieces. Overlapping metal seems to work fine in all of the four-blade easels I've used and taping them on the upper surface would allow you to reposition them until you get the composition right.
Not sure what you want to achieve. Contact print three frames at the same time? They more probably than not will require different exposures, so you'll have to mask two while exposing the third. You want to display the three frames together on the same piece of paper, as a unit?
Maybe you are over-thinking it? Lining up 3 negatives on a sheet isn't that hard, and you could lay a ruler down as guide and take it away when you are ready to lay the glass down.
1. Get a peice of glass and a piece of wood or matt board or heavy card, both cut to the the size of the paper
2. Lay glass face down
3. Mask off the areas of the glass around the negatives with black tape (choose something thinner than the negatives)
4. Place negatives onto glass
5. Place paper on top
6. Place board on top of that
7. Sandwich the whole thing with 5-6 of the large binder clips from the office supply store