Added a half grid Gridfinity base to the original model of @GianfLab 

Print it laying down on the back with manual tree support for gridfinity bases only

can also be printed standing, but will look worse

grid is half grid size (21mm), fully comaptible with full grid

Takes 3,5 x 1 on the full grid base, controller cavering roughly 4 x 2,5 on the full grid base