Battery compartment AA/AAA and SD-Card

This is a battery compartment which can hold up to four AA and AAA batteries and a SD card.

Unfortunately the lid does not fit very well when printed on a Replicator2x. The walls of the lid are not thick enough. I was not able to simply increase wall thickness in AutoCAD. Advice on how to do it is very welcome.

This model is a result of an assignment trying to satisfy the following requirements:

* Hold either 4 AA or 4 AAA batteries
* Hold a SD card
* Can be attached to belt or cam