Is the old clear tray from Form1 compatible with the new Form1+ ?
I tried 2 prints but it doesn’t seem to be working well.
Yep, they should be compatible. If you’re seeing print failures, it could be an old or worn-out resin tank, or something else altogether. I’d recommend dropping a note to our support team at support@formlabs.com, as well as posting some images and questions in our Troubleshooting section.