Many thanks Danny for your model.

https://hackaday.io/project/16665-thor-robot-with-addons-and-gui

I finally 3D printed ART2BODYA_1.stl completely and managed to montage it using glue. The model is completely functional so no complaining here.

During the printing, I have a persistent issue with one of the corners. The flat surface is above the bed so it needs support structures. But every time I printed it, the first real model layer somehow curled up and pulled the support structures up when it cooled making it disconnect from the bed and even from the model.

Bottom right is the first model that came lose and I had to abort. (Note: The model was not printed like that. I just took it back out of the garbage can to take this image)

Bottom up shows a gap, but once glued it became a none-issue.

Bottom left is the glued together prints The upper print I continued printing, so it self rectified it. The lower one I aborted the print, took the model off and started the print from the first layer. Then glued both layers together.

I think it is the pointy parts that is the issue. If we cut the model differently so that these pointing structures are printed directly on the bed instead, it might not curl up.