[johnwalkr]

At work I've had several over the years and the Markforged Mark 2 is hands-down the best I've used. Easy to use, great software (the preprocessor/slicer is online and the support material becomes easier to remove with each update). Above all else, great documentation and easy to follow maintenance guides. It has 2 nozzles, one that dispenses carbon-fibre-filled nylon and one of which dispenses a single carbon fibre for reinforcement. Those wear out fairly quickly but they have wear indicators so you can quickly judge if they need to be replaced. Unlike your example, it doesn't have any upgrade parts as far as I know and hasn't been updated or replaced in 4 years.

Unfortunately it's like $15k and material is also very expensive.