I received this follow-up questions from a previous blog…
If I use a reverse profile, could I have problem with melted pellets or trapped air?
Basically, the purpose of a higher feed temperature in a reverse profile is to ensure the pellets soften enough to stick to the barrel so they convey to the transition zone for melting.
You should conduct a test to ensure what feed zone temperature is best for your material as different heater bands, screws, and barrels behave differently.
There are many times I have found that the same temperature can be used for both the feed and middle temperature zones.
Processing guides can be a great starting point when setting your temperature zones, but do not always reflect the best settings for your machine.