To store a digital scale in my gridfinity system, I designed a holder / bin based on a 4x2x3 solid bin.
The scale I used from Amazon (Defurhome 200g / 0,01g) sits tight in the pocket, but can be easily removed due to the outer finger holes added. However, the scale can be opened and used without having to remove the scale from the bin (see photos).
The bin comes with screw and magnet holes as well as lid, so that it remains stackable when not equipped with the scale.
As with other gridfinity bins: Print in whatever material you prefer. I printed mine in PLA with 0.2 layer height and 15% infill.
The author remixed this model.