Hum... You linked to the page of the original RepRap. Yeah, it was never too popular and everybody stopped using it long ago. People were replacing it since it was published.
Last time I looked, the most popular RepRaps were variants of the Prusa i3 design (that one being more than 10 years old too). But there has been such a large explosion of designs some 5 or 6 years ago that it may be on the minority, even if it's the most popular one.
Anyway, that wiki is full of great information that is perfectly applicable today. Just because the one design that gets the name of the project was improved into an unrecognizable format, it doesn't mean the idea died.
OK but what's the best resource on what has happened / what progress has been made in the last 10-15 years? How are they better and what are the blocking issues?
Oh, I've reread your comment, and you want progress on self-replicating.
RepRap won't lead to a full self-replicating machine. It's by design. The focus on self-replicating is because the most a machine is able to build itself, the cheapest its parts will be. A 3D printer nowadays can print almost every non-commodity part of itself that isn't electronics or runs very hot. There's no progress for it to make on that dimension. It has successfully taken down the price of printers.
What progress has been made on the last decades were about things like easiness of printing, printing speed, materials handling, printer size, print volume, quality of printing.
Last time I looked, the most popular RepRaps were variants of the Prusa i3 design (that one being more than 10 years old too). But there has been such a large explosion of designs some 5 or 6 years ago that it may be on the minority, even if it's the most popular one.
Anyway, that wiki is full of great information that is perfectly applicable today. Just because the one design that gets the name of the project was improved into an unrecognizable format, it doesn't mean the idea died.