This is a discharger case (Capacity tester). Due to the cheapness of the discharger, some sanding or stl tweaking may be required for it to fit. Added case with posts for 2.85mm screws (usually supplied) or 3mm screws Added :: An alternate top with light tubes.. the tubes should be made of transparent pla or left empty. The Tube is forced into the hole and cut level with the top with side cutters