I recently got myself a prusa i3, that I needed to assemble and adjust myself. As expected, the first prints was of quite poor quality. After better adjustment, I improved a bit the print, but I am not quite there yet. I was hoping to get some advices on how to improve the print based on few pictures of the 3dbenchy boat I printed.

The most annoying point, on the following image, is the dent that I have in the hull, on the front of the boat. And one layer appears to be missing or close. And I have another one just like it in the top cabin. I also think that my specific settings on the first layers shouldn't be there, because they don't improve anything, but that is another topic.

Also, when I look on the top, I have a lot of filament strings getting here and there, the path of the tip of the printer is quite visible on the roof and floor, the steering wheel is not to clear, etc.

Also, at the end of the boat, I am supposed to have some letters, but I cannot read them because of the poor definition of the print...

How can I improve the quality of the print? What settings should be looked at?

The material used for printing is PLA. The hotend temperature was set to 215 °C for the first layer, 210 °C for the rest. The bed at 65 °C for the first, then 60 °C. The setting in Slic3r for the fan is between 35% to 100%. If I understand the rule correctly, under 5 sec for a layer, it is 100%, then it decreases proportionally up to 35% if the layer is done in 60 sec. And off otherwise.

The diameter of the filament is set to 1.75, with a nozzle of 0.4 mm. I wonder if I should put it to 0.375 mm.

I otherwise think that it is a genuine prusa, but clearly not from the first iteration. I don't have an arduino on it, but the makerbase chip. (That comes from a kit I bought online.) I would wait to be a bit more confident before attempting any modifications.

The speed for perimeters is 60 mm/s, 30 mm/s for external perimeters. Infill 80 mm/s. Bridges 60 mm/s. Support material 60 mm/s. Non print move: 130 mm/s. There are a couple of other print speed, but I don't think they are that relevant for the case.

After modifications of temperature and cooling, following the answers, I got the following print: (Nozzle 200 °C, fan at 50 %)

Weirdly, it was like the PLA got burned here and there, which was not the case at hotter temperature... But at least, the edges are sharper, and the writings are easier to read! I will try to lower a bit more the temperature, but I would need to fight a bit with my extruder motor, which seems to have hard time pushing the PLA when the temperature is too low.

I tested at an even lower temperature: 190 °C. The result is not pretty, the layer were not sticking to each other. And even at 195 °C, some layer don't attach.