I really like the design from Matthongkong but when I proposed to print it to my wife, she said yes I like it, but she add is it possible in Black and white?
I said, but dear, my printer is only 1 color...
Seeing her disapointment, I redesigned it in 2 parts for printing in in B&W.
It is just 2 parts, it needs to print 2 of each, 1 pair in black and 1 pair in white and it should be ok.
Just be carefull with the eye, I don't know why, but it didn't fit as it is, althought I put tolerance, I had to scale it (see print settings) and I advice to print one to ensure it fit before printing the other.
Then just glue Ying and Yang together.
ATTENTION, for the eyes, I had a problem, I had to scale it 112% (X and Y but keep Z as it is or in size 181824.5) to make it fit
Ying is printed as it is, eyes is printed vertically, thread up