Is this ladder bookcase design strong enough to hold printers?
Interesting design. f I'm understanding it correctly I think it could work, but I would definitely use screws to secure your slide-in shelving and all the other joints. Pocket hole screws can be used if you are concerned about aesthetics. The weakest aspect is probably that it will be a little tippy sideways, depending on how you load it. A horizontal support along the back (similar to how you have it in the front) would help that... it could be shorter in length than the front one, to help change up the look.