40mm to 60mm fan adapter

thingiverse

You might need to tweak the model's settings. If you want the best outcome, consider printing with supports in place - see the kisssslicer slicer results image for a better understanding of what that would look like. Alternatively, if you can manage it, try orienting your printed object 90 degrees so that its flat surface is upwards and doesn't require any kind of support. Some prints do end up successful even without any additional structures. Check the 'made' images online to see some examples.