According to the user guide, the fuser should be adjusted in order to print on envelopes.
What's affected by that adjustment? The temprature? The speed?
Should I adjust the fuser in order to print on thick paper as well?
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Temperature/speed and pressure are adjusted, it is only needed because of the small size, it can cause dents on the fuser, which can make lines on every job after on regular paper, it is certainly not an issue with Letter size paper.