Do not know much about Bukito 3D Printers.
Though I do know much of the 3D Printing problems can be attributed to the adjustments of the 3D Printer itself.

1..Belt tension needs to be periodically adjusted.
2. Slicer software configurations can make the world of difference from a good print to a great print.
3. Extruder gears, Hot-end heater, Parts Fan speed, spool tension feeding the extruder, ect.

Need your help to give me the basics of what you mean.
Is the bed wavy, is it tilted, does it have high and low spots. Please express to the best of your ability so I can get and ideal hot to help.