These characters can be combined with Party Flags by Quin | Download free STL model | Printables.com, which includes the spacers and attachment parts. This set of characters contains:
A to Z
0 to 9
@, #, &, ★ (Star), ♥ (Heart)
The flag (character) face should be only one layer thick, so make sure your first layer print well.
The models work best with a 0.3 mm layer height.
See the Party Flags Collection by Quin | Printables.com for all the parts you can string together.
The author remixed this model.