Hello,
The 3D print done at Vélizy 3DS Fablab was too small (my fault) and I coud not get it OK. Thanks @SR anyway ! So finally I decided to make myself a present, and bought a 3D printer (DIY kit made in France) last Friday evening... A bi-color Dagoma Disco Ultimate, for less than 500 EUR.

I think I got decent results ! (The base diameter of the object is 9 cm.)

See my previous post here : https://r1132100503382-eu1-3dswym.3dexperience.3ds.com/#community:17/post:zbxSKAZcTLGo1lurPPIz8g