Battery Box with Slide Lock Button:

You will need:

• Spring from an old pen (length: 20-25mm, diameter: 4-4.6mm).
  
• A piece of filament for the hinges (seal the ends with a lighter).
  
  

(Hint: Some ballpoint pens have longer springs, like 30mm, if this is your case, you can press spring with your hand for a few seconds to make it smaller)

Two versions of boxes, for AA and 18650 type batteries:

• Storage space for the AA battery version:
  

  • 9x AA Batteries
    
  • 12x AAA Batteries
    
  • 3x CR2025 (3V) Batteries
    
    

• Storage space for the 18650 battery version:
  

  • 12x 18650 Batteries
    
    

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Print Settings (Same for both versions):
Material - PLA
Flow Rate - 0.98 (98%)
Nozzle diameter - 0.6 mm (recomended)
Layer Height - 0.3 mm
Perimeters - 2 (with 0.4 nozzle use 3 perimeters)
Infill - 30%
Support - No
Print Speed - 30mm/s
Print orientation - As in .stl files

Print settings for Batt_insert.stl (Settings below is just a time saver, not necessary):
Layer height: 0.4mm (with 0.6 nozzle)
Set parameter Solid_infill_threshold_area to zero (disable it).

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Note: The color of the slider button in the pictures is for illustration purposes only,
the lid is printed with the slider print-in-place (with the same filament).

Print and enjoy :)