If you happen to have 4 RTL-SDR of various types, you can use this to store them neatly in your Gridfinity system.

Sized for V3, V4, and the black original DVB sticks.

Might fit others and clones if they're in the same size cases.

3x2 Gridfinity bin, stacking lip.

Original base model generated using https://github.com/igalarzab/gridfinity-generator-onshape

Onshape design: https://cad.onshape.com/documents/bf05071ddd1c50580461bf53/w/7402e7ec6cb4dee618542c3b/e/cbe56d32e68d75edc726c80e?renderMode=0&uiState=68580c228158293ad64b5d55