I wanted a nice battery powered fume extractor which is way more convinent than the wired version. I suggest using a 18650 battery and 1S USB C charger as shown below :

Electronics:

• 1 * Power switch (Ø12mm)
• 1 * USB C 1s lion charger
• 1 * 12v converter
• 1 * 18650
• 1 * 120mm PC fan

Miscellaneous:

• Optional : Carbon Filter (5mm thick)
• 4 * M4 short brass insert
• 6 * M3 brass insert
• 6 * M3x6 screw
• 4 * M4x35 screw or M4x30 if you don't mount front and back grid

Assembling:

• Use hot glue for mounting the 18650 battery
• Use double sided tape for mounting the electronics
• Optional : Use a 3 or 4 pin connector for connecting the fan

Print settings:

• PLA or PETG
• Print the Case on its face and use support for the IO panel
• Layer height : 0.2 mm

Filament used :

• Prusament PLA Jet Black
• Bambulab PLA Basic Bambu green