I have had some user error things cause me to replace some parts on my bambu. For example, I destroyed my hot end and hotend cover with an ABS mishap. I was able to fix them really easy. But I definately see the benefit to open source printers.

I want to build a Voron, but I much prefer printing to tinkering... and my Bambu just prints.

That Prusa XL looks pretty good with its multiple heads though..... but a bit out of my price range.