I just installed some floating wall shelves from ikea but my wall is uneven horizontally and one of the shelves is sticking out, not tight to the wall. Is there any way to fix this?
These are the mounting systems:
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I don't agree that cutting these is a good idea. They're tall, and they may have hardware in critical locations that would disallow simple modification. Also, cutting coated surfaces like that often leaves a ragged edge.
I would shim out the mounts to a single plane. Set the mounts at each end and run a line between. Install spacers to bring everything out as needed.
Seeing the mounts I'd offer these tips:
Solar Mike provides one excellent option of cutting off the back edge of the shelf that sticks out.
If you don't have a saw (or the ability to cut a reasonably straight line) you could shim out the "short" shelf so it sticks out as far as the other one.
As an added bonus, it appears that there is some trim below the shelf that would hide the thickness of the shims so they wouldn't be obvious from below!
I'd guess that the gap is about 1/2" so adjust based on actual measurements.
You might be able to get away with replacing the screws that came with the shelf with longer screws that are the same diameter. (For example, if those are 2" #8 wood screws, get 3" #8 wood screws. Take the screws to your local hardware store and compare them to what they have in stock to find out what size they are.) I say might because you're going to have the shelf hanging farther from the wall than it's intended to. This makes it a longer lever and amplifies the stress that the weight of items on the shelf will apply to the screws in the wall. For a couple of stuffed animals/figurines, you'll probably be fine - books, not so much.
Once you've got the longer screws in the wall, leave them sticking out far enough to accommodate the shims and the extra needed for mounting. This may take some fiddling to get them to just the right depth to accommodate the shims/mounting, but still be snug enough for a firm mount.
Note: I'm assuming you don't have the proper tools, please forgive me if that's an incorrect assumption.
The best method would be to scribe the back of the one sticking out. Almost any hand saw could be used: coping saw, hacksaw, jigsaw. You need a compass that can hold a pencil.
Set the compass to the width of the amount sticking out at the front. Now run that compass along the bottom or top of the shelf with the point against the wall and the pencil drawing on the surface of the shelf. Finally, cut along that line for a perfect fit.
If you don't have a coping or jigsaw, you can make a series of relief cuts, entering the back of the shelf to the line, about every half inch. With a less flexible blade, the relief cuts will allow pieces to fall out so you can get a more rigid blade to move along the line.
There are plenty of videos online about this method. Search for "how to scribe trim".
Instead of cutting off a section, how about adding a strip of wood. 1/2" or 3/4" plywood would work well. Cut the length to be just shorter than all the shelves together - e.g., if it is 2" shorter then if you center it behind the shelves you would have 1" of gap on each end and would not be able to see that there is wood - in fact, it would actually make the shelf appear to float even more. Cut the width (i.e., rip a strip off of a larger piece) to just under the height of the back of the shelves. Screw it in into the studs and then screw the shelves into the plywood. The plywood will bend a little (and/or you can shim it out as needed) to fit the wall so that the shelves will not have a big difference between them like they do now.