About this 3D model

Might as well warn you, it's work in progress so not totally optimized. But it is a model that has given me a crazy pain in terms of errors and although there are still some it is printable. The connections are a priori good but my printed test model being too small to be sure I have a pti doubt, a blow of file or a blow of lighter will do the job at worst. I make this model available in order to avoid leaving it lying around on my hard drive because in fact I started it a while ago but having quite a few difficulties with it, I had dropped it. So I made a printable version but I'll probably stay with it even though it's not definitive. Or maybe one day....