This model is a follow up of IKEA SUNNERSTA One Bin Rail by Nikola | Download free STL model | Printables.com it is 320 mm in total but it is assembled from two prints (pieces). You can hang one IKEA SUNNERSTA Tray or two Bins.
You can find also a model 280 mm long only for two bins but not a tray.
The author marked this model as their own original creation.