[Solved] Making stickers from scratch

[Magnus Forsberg]

What is sticker body?

All stickers are actually very thin boxes, only 0.25 ldu thick. Yours is missing the "bottom" of that box.
When making a sticker it's a good idea to start on a template. This will generate a sticker backside in you file.

   

But this box has a square shape, not rounded corners. But it will place your surface on the correct level, in your sticker.

You keep refering to the exported file as an "ldr". That's wrong. You export and create a dat file.