I made multiple versions of this ramp but the last two I am gonna publish.
One is 14x40mm and another 12x80mm. The firs one did not work in my case - it is probably too steep and triggered staircase warning by the robot. The 12x80mm works like charm.
When printing the longer one (12x80mm), you have to adjust it by 8.53°.
The author hasn't provided the model origin yet.