There's also an economy of scale going on that snowballed a ton. In 2014 I got my first printer off Craigslist. The bom was like $1200. Steppers were like $80 ea, a ramps board without controllers was 80-120, the controllers were 20-40 each, the heated bed was a huge PCB so also not cheap. Cheap PCB houses were nascent at the time. Arduinos we're $50+. Power supplies like 40-150.
Now you can get the steppers from Amazon for $8, a control board with stepper controllers for $20 with a built in 32 bit MCU. At scale if you're building a lot of them those parts are going to be even cheaper maybe even another order of magnitude. For a while it was difficult to actually even comprehend how much cheaper stuff was getting and what that lets you do. And then you see a resin printer for $140 and realize it's a cast-off I found screen one stepper and some extruded parts.
Now you can get the steppers from Amazon for $8, a control board with stepper controllers for $20 with a built in 32 bit MCU. At scale if you're building a lot of them those parts are going to be even cheaper maybe even another order of magnitude. For a while it was difficult to actually even comprehend how much cheaper stuff was getting and what that lets you do. And then you see a resin printer for $140 and realize it's a cast-off I found screen one stepper and some extruded parts.