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I don’t think using the fan port will be any different. On your next burn try getting version 4.i think that is last pre- decimal version.If the stuttering goes away then I’ll definitely make the decimals optional. Using host software may slow things down too or your acceleration settings could be it too. I’m Sure you’ll meter that divider output before you connect your driver but it should work. I think there’s a FASTPWM definition that can be enabled on the fan pins. I’ve read some posts suggesting it improves laser grayscale definition but haven’t verified this.