I have a Monoprice Mine Select as well. It’s a great little printer and I get really good print from it. This may seem obvious but make sure that print bed is level. My Monoprice Mini is very picky about having a level print bed. I take the time once a month or so to relevel, side to side, front to back, and diagonal across the bed. When I get lazy about this my prints are garbage. Hope that tip helps.