Hi,
recently I got an old Silhouette Alta from a friend who was rather disappointed by it. Being into 3D printing for several years now I really have to say that the Silhouette Alta sucks in many ways. However, you can make a pretty decents PLA printer out of it by uploading Klipper firmware and attach a fan. It can now print PLA autonomously with more than 80mm/s with pretty decent quality.
I described the details here: https://www.thingiverse.com/thing:5208373
Best regards
Silhouette_Alta_Pinout.pdf