Peel any protective coatings off of each piece of acrylic. Tips here.
If you ordered multiple Cubby Grid units, sort all of the parts by the letter inscribed on each wall. (This may already have been done for you.) For example, all of the parts for Insert 1 will be labeled "A"; the parts for Insert 2 will be labeled "B"; and so on.
For cases where extra support will be needed, your Cubby Grid will come with a brace. Braces look a bit like the normal walls, but are only an inch tall. Put them into your drawer before you install the Cubby Grid walls. You can orient them vertically,
or you can lay them flat on the drawer bottom, depending on which works better for you. If you're going to set them upright, you may want to tape them in place temporarily to keep them from falling over.
Once the braces are in place (if applicable), assemble the rest of the Cubby Grid by fitting together the notches in the walls. Set the horizontal walls into the drawer first with their notches oriented upwards. Then add the vertical (front-to-back) walls.
If you have a lot of horizontal walls, it can be tricky getting started. We've found a good way to manage all these walls:
Figure out which are the bottom pieces.
Place all the bottom pieces into the drawer in the orientation where they will end up.
Now take one of the top pieces and put its end down into one corner and angle it both up and away from your body.
Begin connecting the bottom pieces one by one to this top piece as you slowly lower the up/down angle of that top piece. You won't be able to use the slots of the bottom pieces but only the downward-facing slots of the top piece.
This is how it should look once you have engaged all the bottom pieces with it. The top piece is only halfway down.
Now shimmy all the pieces around to square. If one of the bottom pieces flops down, just gently bring it back up.
This is how it should look when all is square.
Now bring in a 2nd top piece and bring it into full engagement with the bottom pieces. It should go all the way down.
Now everything should be very stable. Fully engage the other top pieces.
Done.
If you find that the ends of your Cubby Grid are a bit too floppy for your application, just pop a wedge out of
one of the walls, and insert it into one of the two little notches in the end of the wall. The wedge will brace
against the side of the drawer and help prevent the acrylic wall from moving.