Adjust Scottie.FCStd for your tissue box and cabient with FreeCAD.
It is also good for kitchen paper boxes.
[Files]
Scottie.FCStd is FreeCAD source.
Scottie12.stl has 12 mm width.
MD5 (Scottie.FCStd) = 397e69127ef7a330d3a564bc314468b3
MD5 (Scottie12.stl) = 8b82c4845483c0f2e28d2ad374fa6c2b