Is it easy to maintain? What about spare parts?

The trike, grinder and espresso unit all share the goal of being as robust and as simple to maintain as possible and not having any electrical elements certainly helps with this goal. Simple daily routines for the coffee machinery will keep the machine in good working order. The grinder can easily be maintained by any experienced barista as part of their daily routine. Similarly the tricycle will use mostly standardized bicycle components to make sure it can be repaired locally. However, it is possible that certain specialist parts may still have to be ordered from the Velopresso team.