Battery Holder Keyring For 312 Hearing Aid Batteries Battery 3D Printed Designed to hold 4 312 batteries. 3D Printed with white PET-G (plastic) Any questions please ask. Please note, these items are 3D printed (not injection moulded) 3D printing works by building up very thin layers of plastic. Which this in mind some layer lines will be visible. Every care will be taken to provide the best quality and strength.
