Attach an Ikea SKADIS pegboard to the side of an Ikea BROR shelf.
The 3-hole variants should work for any SKADIS/BROR size combinations as long as the SKADIS board is wide enough. I've tested the 3-hole model using a square SKADIS pegboard on the sides of the deep BROR shelf, and a skinny SKADIS on the sides of a shallow BROR shelf.
There are two mount types. One for attaching the pegboard flush to the shelf using just an M5 screw, and one that provides clearance for an M5 nut or screw head between the pegboard and shelf leg for extra secure mounting. If using the latter or if there will be a lot of weight on your SKADIS then I recommend printing 4 mounts.
Update: I've added a 3-hole variant of each mount type. I recommend using this one as it is more versatile, and should not be any weaker than the 2-hole variant. It is necessary to accommodate the 55cm deep BROR shelf.
You need to print at least two, but ideally four mounts. I've found 4 perimeters and 20% infill to provide plenty of strength for my needs, but feel free to experiment.
Slide each mount over a BROR shelf mounting point. The slot in the mount will help you align it to the screw hole in the shelf.
Attach each mount to the BROR's shelf mount points using one M5 screw from the inside of the shelf:
Attach the SKADIS to each mount by insert screw(s) from the SKADIS side:
NOTE: To use a SKADIS on the side of a 55cm deep BROR shelf, the spacing is such that you must use the center hole in the mount(s) on one post, and outer hole(s) on mounts on the opposite post.
The author marked this model as their own original creation.