180 is too low. In my tests, I had to use higher temperatures but add more ventilation as the SM default cooling is flawed (as Brent suggested).
/Edit to clarify since I’m going against other suggestions, I got better results using higher temp AND added cooling, than simply try to go for lower temps.
Also, you can try to scale the object up or adding a second object.
Your test object has curling hell-inducing features, so this might help you: