How to correctly print an object with supports

Question

I'm trying to print the following model in my Prusa printer using its Slic3r PE software.

Ferment Air Lock

In the comments of the model it says that the way to print is the with the filler opener downside to the printing board.

This is how I have it in Slic3r:

When I print it I get this horrible form and I have to stop in order to avoid waste of material.

When I look in the layers tab and then scroll up to see layer workflow I can see this:

So that means is trying to print like in the "air" something without any support.

Any clue how to print this? I'm kind of new to 3d printing.

Answer 1

You need to put a check mark to enable supports in Slic3r as you cannot print in mid-air.

This option is found under "Print settings" with header name "Support settings". Please look at the Slic3r manual for more options.