The FlexHCD is new generation sample changer for macromolecular crystallography beamlines capable to work with SPINE SC3 and Unipucks containers

The High Capacity Dewar is organized in 8 Cells, each containing 3 Pucks.

Odd cells can host SPINE pucks, even are dedicated to Unipucks
| Plate number | Segment Numbers | Segment type |
| 1 | 1, 2, 3 (1:1,1:2,1:3) | SPINE |
| 2 | 4, 5, 6 (2:1,2:2,2:3) | Unipuck |
| 3 | 7, 8, 9 (3:1,3:2,3:3) | SPINE |
| 4 | 10, 11, 12 (4:1,4:2,4:3) | Unipuck |
| 5 | 13, 14, 15 (5:1,5:2,5:3) | SPINE |
| 6 | 16, 17, 18 (6:1,6:2,6:3) | Unipuck |
| 7 | 19, 20, 21 (7:1,7:2,7:3) | SPINE |
| 8 | 22, 23, 24 (8:1,8:2,8:3) | Unipuck |
FlexHCD is completely operated from MXCuBE2 interface.
The image below explains some of the functionalities.
Every SC3 and Unipuck puck has a guiding groove. During loading this groove must be aligned with the guiding finger on the puck slot inside the HCD to ensure the pucks are correctly positioned (see below)