Chữ Cái - Dạng Ghép Hình

These are short and flat so they can print with just about any settings and with no support needed. Make sure the orientation is letter side up as these files were drawn so they import on the wrong face down. 

If you want to have a contrasting color, just insert a filament change using your slicer at the layer where the letter starts. 
 

About 9 pieces can fit comfortably on an Ender 3 bed. A full set printed with multiples of the more commonly used letters following roughly this chart: https://www3.nd.edu/~busiforc/handouts/cryptography/letterfrequencies.html would have 9 E tiles and 107 tiles total, filling 13 beds. Printed with 1mm walls and 15% infill, it uses 0.75kg of material.