The table yupana are a set of Inca artifacts which some have called computing instruments. But they're probably not computing instruments.
Here is a short video about the table yupana:
These are STL files that can be 3D-printed. Most of these objects are pretty large, so you may have to scale them down, or print in pieces.
 |
 |
 |
 |
I am releasing these into the public domain: anyone has my permission to do whatever you want with them.