The range I go to doesn't check anything, and it's a "clean, well-lighted place." But they have an RSO on the line at all times, and they definitely watch you.

The time I went to sketchy possibly fascist industrial park range, they didn't even have an RSO on the back line where I was but once every fifteen minutes to peek in the door and then close it again.

You could probably get away with it at a sketchy range, but I wouldn't do it the first time you go. Even then, I might add a "I was curious, have you ever had anyone come in with a 3DP gun?" and see what they say.