The Prusa mini K Factor / Linear Advance is well calibrated for stock. If you have changed your extruder / hotend you might need to calibrate the Linear Advance. This fixes issues where it is blobbing like over extrusion on edges yet when you lower extrusion multiplier suddenly your infill is showing signs of under extrusion. The linear advance accommodates for the pressure that can build up when printing and makes prints even better.
Hand edited for the Prusa Mini I have included calibration prints for:
Each one is provided in four Nozzle sizes: 0.25, 0.4, 0.6, and 0.8. Hand edits have been done to the start and end g-code to fit the Prusa Mini.
The value you get from this should go into filament Start G-code. You should read this guide on how to determine what setting is right: https://help.prusa3d.com/article/linear-advance_2252
The author hasn't provided the model origin yet.