Jumbo Clip
thingiverse
These clips are extremely strong, simple to print, and easy to use. You can use them for making forts, mounting odds and ends, etc. Really, it's just a general purpose item. There are two designs, one completely solid (26g with my settings), and the other with holes to save filament(18g). As far as I know, they have the same strength.
Download Model from thingiverse
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