I’d never made a ring binder before, and am quite intrigued by book binding, so this was my baby step in that direction. I used black chrome-tanned Kangaroo leather.
Steps:
I started out by cutting card board to size. Nothing special about the card board, it was just the packaging material from a set of Ikea drawers
I pasted graph paper behind the three panels to keep them aligned, then trimmed off the excess
I cut two roo panels 1cm bigger all around
Now it was time to assemble the whole thing. This is the point at which I should probably have stamped my logo, but I completely forgot. Oh well, maybe on the next one.
I glued the front panel to the card boards and smoothed out any air bubbles with a bone folder
I punched through the back of the leather to mark the ring binder holes
With the mechanism holes clearly marked, I glued the inner panel to the card boards, once again smoothing out any air bubbles
Once the glue had set I used the outer holes as a guide to punch all the way through the inner leather
I punched the stitching holes with pricking irons. On this one I used 3mm KL French irons
I stitched with black Vinymo MBT #8 thread. The total thickness was probably about 1-2 mm
To finish off I attached some M3 nuts and bolts to fasten the binder mechanism, and rounded the corners with an corner punch