Have you looked at the voron machines? They come in either a self-sourced or kit form and you build it from the ground up.

The sibor or fystec V0.2 kits often can go on sale for less than 400 on Ali-express.

The best part about these builds is the community and the dedication to making fantastic printers to at you can build and learn with.

Before even using the deck I updated it, pre-downloaded the steamos onto a usb drive.

The install was very straightforward, highly recommended the upgrade. My only regret is is didn’t get the 1Tb drive