This is a Raspberry Pi camera mount for my Ender 3. It attaches to the 20x20 alu rail on the top. I wanted something to get a front-top view that I can also swivel up when I need to access the print area. I designed it for a Raspberry Pi Camera v1.3

Print the arm thrice (or as many times as you need for your desired arm length) Hardware needed:

• M3 screws (and optionally nuts, though for me it was stiff enough without nuts)
  • Between each part, so using base + 3x arm + cam = 4 screws
• M4 + T-Nut (to mount the base)

Print the arm with no support so the cable channel is free.