Underruns during simulation
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After running a simulation of a print, the M122 report shows: Underruns: 2881, 0
When I print these files, I never typically get underruns (that I've noticed), but at high speeds I do see some hiccups.
I assume this is merely because the simulation is going as fast as possible, and my high-resolution gcode file is overloading the system.
Is this acceptable behaviour and does it affect simulated time?
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Your diagnosis is correct. The simulated print time may be slightly longer than the actual print time.