Yet another reason why fully open hardware and open software is so important + of course a fully open source slicing pipeline.

It might be a bit less convenient than a shiny vendor locked Bamboolab closed machine but it is perfectly doable.

A filament 3D printer is basically just a control board, firmware (like Marlin), bunch of off the shelf steppers, two thermistors, heatbed and nozzle heater. If you have modern stepper drivers you don't even need end stop switches.

Put this together and you have a machine you fully own and control and can easily repair or upgrade. Then just feed it GCODE generated by something like Prusa Slic3r from STL/obj/step files and that's it.

Avoids any shenanigans like forcing you to use only blessed consumables or trying to dictate what you can print.