These LEGO work great with official LEGO.
I designed a few LEGO pieces here. The IPTs are included, so they can be easily edited. When slicing, scale the pieces 10x. If you wish for me to create a custom LEGO piece, please let me know.
The LEGO seen above were printed with PLA on a Type A Series 1 printer. I used 1.75 mm filament and .25 mm layer height.