I have done some experimenting with 1.2.1 and it looks like Orca is causing the toolhead to return to the X=0, Y=0 position even though a prime tower is used. This is causing the separation of objects from the print sheet. Here is a screenshot. Note the position of the prime tower behind the object.
The prime tower feature in general seems like a source of at least two other issues:
- Sometimes the second material is generated with an increasing -Y offset, so that successive layers are generated closer and closer to the front of the print sheet, and cause a G-code out of bounds error. This requires toggling the prime tower off, slicing, turning it on again, and slicing again. Sometimes this process must be repeated.
- Orca often crashes while slicing a print with a prime tower enabled.