PETG on a PLA support interface on Snapmaker U1

Snapmaker forum thread: use a PLA or Bambu Support-for-PLA-PETG interface only (support/raft interface), top Z distance 0 to 0.1 mm (0.1 worked better with breakaway PLA), and iron (smooth) the interface: one user went from about 15% failures to 0%. For tiny areas one owner painted the first 3 perimeters as a separate PETG profile at 280 °C and 4 mm³/s so they fuse onto the interface.