Alphabet Puzzle - Quebra cabeça em formato de alfabeto

I also made the file available in AutoCAD if someone wants to modify this thing.

File Number 0 - head to connect in the left and right.
File Number 1 - head to connect in the top and bottom.
No Number - Letter.

It is necessary to adjusts this thing after printed to put them together.
It not easy to insert letters inside the puzzle.
I use sandpaper to give the pieces a better finish.

Configuration:
First layer and layer height: 0.3mm
Infil: 5% ( if you don't finalize good the piec