How do I print this?

I am trying to make a hollow box with a cutout for a pipe. I need it to have a raised lip to keep rain from flowing in. If I print it upside down, it wants to make a whole sheet of supports just for this little lip. If I leave it right side up, the supports are even more extreme. How else can I print this?

I am a beginner, making this with Tinkercad. Printer is an A1 with PETG.

I would do some more design work to remove the support requirement. If you orient it with the largest surface on the bottom so the U is open on the top then it appears (cant see it all) that you just have the small overhang of the U that protrudes out of the box.

OK, so instead of that lip forming a 90 degree angle there make a chamfer so you get a 45.

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Idea 1

You could create a 0.2mm layer that fits inside the gap at the top.

After printing, trim it off.

Depending on the span, it may not require any support.

Idea 2

Alternatively, create the lip portion a separate model with a lip of its own allowing you to glue it to the main model.

The current tall face of the lip would become the base making the up easily printable and the main model would be printed upside down.

Thanks, I think printing it in 2 parts is the way to go.