18650 Battery Holder

A compact, 3D-printable holder for 2 or 4 18650 lithium-ion cells, designed to power your RookiDroid builds, including the Hexapod Macaroon and the Arcade Controller. It holds the cells securely, keeps them properly aligned, and leaves the wiring connections accessible so you can swap or recharge batteries without taking your project apart.

Highlights

• Fits standard 18650 cells (~18 mm × 65 mm)
• Designed to mount directly to Hexapods
• Free STL download, open-source like the rest of the RookiDroid lineup

Print settings (suggested)

• Material: PLA / PETG
• Layer height: 0.2 mm
• Infill: 20–30%
• Supports: yes

Assembly notes

• Hardware needed: contacts / spring plates / wire gauge

Safety note: Always check cell polarity, use protected 18650 cells or a battery management circuit, and never short the terminals.