The original model doesn't stack, and it was too big (x,y) for Dust 1947 maps. I modified it and tapered the top to make them stack-able (WAY better for storage) and I made the model so it can be resized to match the 90x90 mm map squares.

If you want to print it at 90x90 mm, I have included a resized top (that you should be able to print straight up), but you will need to scale the tower to 90. Easy to do. You can then also make it as tall as you would like and it will still be stack-able.