IKEA BILLY Side Shelf

Hello. This is my first upload to MakerWorld. IKEA BILLY is a cost-effective storage solution. I recently started organizing various items in my IKEA BILLY. https://www.ikea.com/kr/en/p/billy-bookcase-white-90522038/ While additional drawers can be purchased separately from IKEA, I decided to make my own to save on costs and delivery time. To assemble, insert two triangular supports at the same height on one side of the shelf, then fit the elongated top panel into the grooves, and you're done! I applied truss structure and woodworking joinery techniques for better weight distribution.To create a two-tier storage space, you need to print four triangular supports and four top panels. By assembling the other side in the same way, you can store items like laptops (up to 15 inches) or keyboards in a very compact space. Please let me know if there are any improvements needed during printing and use! Thanks!