Holds 6 rechargeable AAA Batteries. Place batteries nub up for “Charged” indication, and nub down for “Depleted” indication. 

I have tested it with the following AAA Battery Brands: 

• Amazon Basics AAA High-Capacity - https://amzn.to/3NCBMJf 
• EBL Rechargeable AAA Batteries - https://amzn.to/3DrbKUu 
• Panasonic Eneloop BK-4MCCA8BA AAA Batteries - https://amzn.to/35vODf6 
• Energizer Rechargeable AAA Batteries - https://amzn.to/3tW3U2f 

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I have only tested this model using the default 0.35mm Fast preset in Prusa Slic3r 2.2.0 with the following amendments made.

• 3-perimeters
• 3-top layers
• 3-bottom layers
• 20% infill
• Cubic Infill pattern
• Monotonic Top and Bottom Pattern

Print time on a stock Prusa i3 MK2s is about 2-hours 32-minutes and uses an estimated 61.81-grams of PLA filament.

PLA Used: Polymaker Polylite PLA - https://amzn.to/3mTrbuU