Thanks Mike
finally I found ?a 3D printing website where, after uploaded the file, it indicates the global dimension if the file is in mm or in inch so I realized that the file was in mm.
There is a lot of material available (see here ? )?
Plastics are quite cheap and I selected ASA : 10 € + shipping) as ASA have good UV properties and HDT (glass transition ????) ?is a nice 96-102C , higher than PFA or PETG https://craftcloud3d.com/material-guide# )
i selected it white to avoid heating in daytime if exposed to sun
I will receive the 2 pieces Friday normally!
great !
thanks for everything?
Raphael