This is a remix of GreenBolivian's lense caps for BLF Q8 resized to fit the Q8 Plus, the plus is a little larger (model scale 107.5%).

I would suggest printing in a transparent material or something that can handle higher temps than PETG. If you have an opaque lens cap on and put it on turbo it will melt the lens cap quite quickly and there's no way to tell until you see the smoke. Using clear PETG it hasn't gotten hot enough to melt so far with my print settings and it acts as a bit of a diffuser so you can use it with the cap on (wouldn't leave it on turbo for long just in case).

For my print I used a 0.6mm nozzle.
Prusament PETG clear and Prusament PETG galaxy black
Line width: 1.2mm
Layer height: 0.48 (0.2mm for sides starting at 1.2mm height)
Fill: Concentric

The 15mm version is in 2 merged parts that can be split for mmu printing as shown in photos.