There’s no need to buy anything new. Just run the calibrations and see if it solves the problem.
If not, what may be necessary is to tighten the linear modules, probably mainly of the Y-axis (that moves the print bed). This thread might be helpful (although it is on the X axis - the procedure is the same): Excessive play in x-axis linear module bracket - Also, there’s a wiki article on that: https://wiki.snapmaker.com/en/Snapmaker_2/Linear_module
The indication that you’d need to do this is if your print bed “rocks”/“wobbles” when it changes direction of movement.