Engineering materials are lying around. Re-instance to refresh the material drop. Sometimes 1 or 2 rare items are dropped like Chemical Manipulators and Chemical Storage Units.
There is also a single data point that can be scanned.
An abandoned planetary mining settlement, on planetary object A 5 at 44.818, -31.389. Here is a video on gathering materials here. Engineering materials spawn here, here is a list of materials and the span points on a map of Dav's Hope by Dognoosh.