I lost my chamber flag for my shotgun so instead of buying a new one I just made my own! 

If you're importing the .stl file(s), then the Basic versions don't need any supports.  However the CLEAR version will need supports for the raised text.  I suggest organic supports if you're using PrusaSlicer 2.6 or greater.

The gcode files for the CLEAR versions already have organic supports generated for them.

Update 01/14/2024:  I noticed that my original chamber flag models were a bit easy to break, especially the CLEAR version.  If you pushed on the flag with nominal force or laid your shotgun with the chamber side down the flag more often than not broke.   It also breaks very easily if your bolt snaps forward accidentally.

So to remedy that, I remade and reorganized the versions where V1 now references all of the original versions and V2 is the update as a much thicker and reinforced version.  With V2, you'll find that the chamber flag will now not break so easily.  In general, one accidental bolt snap forward won't break the flag.  Two accidental snaps most likely not, but anymore than that and you're rolling the dice.  Of course, it also depends on how many walls and how much infill you've used to help with reinforcement so your mileage may vary.

The gcode files are defaulted to 2 walls with 20% infill.  Personally, I did a 50% infill with 5 walls and it's really solid as I was able to do two bolt snaps forward without breaking the flag but the third one did.  However, you can experiment to find what's best for you.

Legend:

• Version 1 (V1) Chamber Flags
  • Basic
    • The original, thinner chamber flag
  • Clear
    • The original, thinner chamber flag with an extra 90 degree protrusion with the word CLEAR on it
• Version 2 (V2) Chamber Flags
  • Basic
    • The same as V1, but much thicker and reinforced so it doesn't break so easily
  • Clear
    • The same as V1, but much thicker and reinforced so it doesn't break so easily