First layer of the Cap version 2 needs to be transparent. On other you need to use transparent Filamet later. Just pause your Printer at the right time.
I used WLED as a Controller. A mix of LED Strips for the sides and for the pistol, single LEDs, and a lot of hot glue.
Single LED: https://www.amazon.de/dp/B0B8D53RMS?ref=ppx_yo2ov_dt_b_fed_asin_title
Use 5x3mm Screws to tighten it.
The author marked this model as their own original creation.