Hi,
I have made my own 3D object in blender and exported it as an stl file. When I try to slice it in cura, though, it only shows the perimitor of the object.
The next thing I did was save it as gcode and printed it on an ultimaker 2+, and sure enough it just printed the perimitor.

I have tried remeshing the model in meshmixer, but unfortunately with no luck. Could it be that the dimensions are too small? its 8.56cm x 5.4cm x 0.04cm (the 0.04 is height).
The layer resolution of the ultimaker 2+ is 20 microns though, which is 0.002cm, so I don't see why the dimensions should be a problem?
Can anyone help me with this?

Thank you so much!
Credit card with indent.stl