Hello,
My laser, a TWOTREE TTS-20 PRO is losing X position a little every time I do a second pass on something. Is there a way I can adjust this problem? Thanks.
It sounds as if your X-axis motor has missed some steps. Not familiar with that model but if it has a homing routine, you might want to re-home it before attempting the second pass. That should return the system to a geometrically correct state. Having said that, it is still unclear where the missed steps happened, so the already engraved/cut parts might contain some errors.
Reducing speeds and accelerations may help avoid the problem; some experimentation is required.
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Due to recent, related experience, I might suggest seeing if your X-axis belt is a little loose.