1x1x4 Gridfinity block for two BIC-lighters. The fit is quite loose to make it easy to remove. A chamfer is added at the top to make it easy to slide in.
Built with OpenScad based on the work of kennetek.
https://www.printables.com/de/model/274917-gridfinity-rebuilt-in-openscad
or
The author marked this model as their own original creation.