We got a IROBOT Roomba 960 for our new apartment. The apartment has however in one door frame there's a step of about 26mm (roughly 1 inch).
What's the best way for the Roomba to overcome this obstacle. I was thinking about building a small ramp. Is there a better/easier way to achieve this (except for lifting it manually to the other room)? If not, what angle should I use for the ramp, that the Roomba will be able to climb it on it's own?