I wanted to clean up my desk and make a holder that would hold my Mac Mini along with an external hard drive. I made multiple mounting holes depending on how you want to position the holders. The external holder will mount to either the left or right side of the holder. You'll need 4 x M4x12mm screws for the MacMini holder. The external is 2TB WesternDigital external https://www.amazon.com/dp/B07GKK35BT?ref=ppx_yo2ov_dt_b_product_details&th=1 It measures 4.33 x 3.21 x 5 inches. The external holder will require 3 M3x8mm screws. I was not worried about the heat, so I printed mine in Bambu Lab PLA Tough.