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I just got my S1 and I am using the rotary tool for tumblers.  I'm doing one after another and stopping between about every 2 to clean the laser and fans.  I've done about 7 tumblers and the quality of the engraving is not as good as it was when I first started them.  it's not as deep and crisp looking.  Power and speed settings haven't changed…what else could be wrong?