3 model

Free

Anet A8 Dual Mosfet, RPi, 4 Channel Relay, & Motherboard Case with Reset Button

Thingiverse

Free

Ventilation channel of drivers for CTC / FlashForge creator / Replicator dual

Thingiverse

Free

AA and AAA Battery Dispenser (Gravity Feed, Dual Channel)

Thingiverse