This tool has a cube at one end for grouting inside corners, and a sphere at the other end for applying caulking/sealant/silicone.
Design features
Two-in-one tool saves space on your hard disk.
Different sizes available.
Printing instructions
Choose the size you want.
I recommend flex with 20% infill.
Print the .stl file as oriented (cube down, handle going upwards).
Usage instructions
Follow the directions for your materials.
Notes
I designed this model in OpenSCAD and it's fully parameterized. If you'd like a variation on the cube or sphere size, or tool length, send me a message and I'll see what I can do.