At first glance, your problem is with underextrusion on the first layer. If the other layers are okay, consider to check your bed leveling/nozzle clearance and your slicer settings. You mention a raft, which implies that you've removed the raft to take the photo. Do the first layers of the raft appear complete? If they are better than what you show in the photo, I'd aim at the slicer settings. If you have a genuine Prusa Mk3s, you should be able to print without a raft.