IKEA Lack Side-by-Side Stacked Joiner

Arrow should be pointed up Here's the onshape file if you want to mess with it:https://cad.onshape.com/documents/ba21cfe0c88eac614ed3e3bd/w/72cf512bbbf88070d23d407a/e/fb2b62dbd35413f90d53fe3c?renderMode=0&uiState=65c95081504ed74ceb4f21da