This is a sandpaper rack made from MadebyA2 model. It needed tons of screws while this one mostly uses printed dowels (studs or pins) as fasteners.
These dowels are compatible with the original design, saving more than 28 screws per level!!!
You can glue them together but they are press-fit so it is not required. Mine is holding very well without any glue at 12 levels! The dowels are voluntarily made offset to make printing easier, they must be printed horizontally or it won't be solid!
To assemble, you will need a good pair of pliers to insert the dowels, x4 M3 srews and nuts (per plate) and the followings printed parts :
Initial setting :
Then for each new level you will need :
To assemble:

The supplied pictures should help you to assemble the unit correctly. The only worry you have is making the dowel offset direction correctly.
Hopes you like it and it is as useful as it is for me!!!
The author remixed this model.
I made this version with 2 major modifications in mind, using way less screws and make it sandpaper size. So I made the level in 2 parts as they will only use 4 screws. Everything else is held together using printed dowels (studs or pins), that way, it removes the need for 40 screws and 28 screws per additionnal level! The dowels are compatible with the original design too! I also supply a full plate level for those who have a larger printer available (it needs to be at least 310mm wide!)