The Smoothie was a pioneer of 32 bit controllers and amogst first boards to hit the market.
For a 3D printer are needed complex computations in order to deal with different printer types (Core XY, Delta etc) and multiple extruders.
This is a beautiful designed software and features high code “modularity”
Official board it’s here and we highly encourage to buy it :
another implementation it’s :
Designed boards that are not necessarily available on market :
HAs even a git repo :
A project that I have used to make my own board :
HAd a nice product and he shared his project also on github
Chinese clones :
If you know about other boards please let me know.