I designed this model for people to create a 18650 accupack with. I left the connector holes internally on 3mm so you can use your own connectors of choise to connect the 18650 batteries together. The top and bottom have lanes, also for easy connection of the 18650 batteries. The 3mm holes can be drilled out to the size that is needed / wanted. You can stack as high as you like with this design. Just print more models and stack them. This is the mega 18650 accupack wich has space for 100 18650 battery cells per layer.

There are also other models available. You can find them here:

The normal 18650 accupack wich has space for 25 cells per layer:http://www.cgtrader.com/3d-print-models/hobby-diy/electronics/18650-accupack

The large 18650 accupack wich has space for 50 cells per layer:http://www.cgtrader.com/3d-print-models/hobby-diy/electronics/18650-battery-pack-large