Failed 3D prints is something that many 3D printer operators have experienced.
The most critical moment during a 3D print usually is the first layer. The model has to firmly stick to the build-platform in order for the 3D model print correctly.
The blob you can see here is a #3DBenchy 3D-printed on an FFF 3D printer using standard settings: 0.2 mm/layer and 2 perimeters.
The build-plate was not calibrated correctly being too far away from the printhead. The first layer detached from the plate surface resulting in a blob of molten plastic that followed the printhead’s movement.