Silicone sealant & caulk finishing tool
thingiverse
I had a similar tool for finishing the silicone sealant between worktops and tiles but the diameter of the ball head was too small for what I needed. This tool has a 15mm diameter but can be scaled up or down in your slicer. Prints in 30 mins at 0.2mm layer height. Needs a small amount of support material under the ball.
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