I designed this to fit my iPhone 12 Pro. I don't know if the dimensions for the 12 Pro and iPhone 12's are the same, so I don't know if it will fit a regular 12 or 12 Pro Max. If you try on something other than a 12 Pro, please leave a comment to let me know how it worked.

Dimensions (from digital calipers) of my 12 Pro I used when designing to help you decide if it fits another iPhone:
Length=146.8 mm
Width= 71.6 mm
Depth=7.9 mm

Camera Hole= 33.6 mmx31.1 mm

If you want the symbol to be a different color, then change at 17.5 mm
It should be the same for the Rebel and Imperial Cog, but I haven't printed the cog yet so I can't confirm, but it'll be close.

By the way, the points on the Rebel symbol are pretty sharp. I couldn't angle them so they weren't so sharp in the design, so I just use my nippers and cut them off at 30 degrees or so. Now they don't catch on my pocket or fingers.

I upgraded my Ender 3 Pro with a direct drive extruder so I could print TPU. However, I did try printing this with PLA, and it seems to work. One corner did pull up from the bed, so it didn't fit perfectly, but I think it might still work. If you try PLA, please leave a comment to let me know how it worked.