[Topspinmo]

IMO if you dryer vent exits up to roof it needs cleaned more often do to gravity pushing air up. I’m lucky my dryer vents to outside wall and house about 3 foot or so from dryer. Still if you have offset and hose snaked into it, which slows volume down where lint can collect it needs to be check if you have low flow on outside vent. Even if don’t lint still builds up over time in around and through blower motor. I do everything that don’t require licensed contractor and permits.

I had photos that show lint buildup inside dryer, but I must of deleted them?

Here’s photo of vent ducting I put on my dryer to get maximum air flow as possible. Straight through to out side.