3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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It could be a lot of things. Temperature is a big one, are you letting the bed heat up completely for a consistent amount of time before each print, could heat be impacting your measurements, some things measure different when heated a bit? You probably aren't printing enclosed, but my voron for example expands upwards almost an entire layer over the first hour of printing. Is there an intermittent air flow that could be impacting how hot your bed really is? Have you verified there is no slop or backlash in your z lead screws and connections? I had decent results on my sidewinder using POM anti backlash nuts. Same for the stability of your measuring tool. Have you checked that it's not z tilt from turning off the motors between prints?
The bed is completely heating before each print, I just about always let it preheat and do something else before I start the print
It is not enclosed, would that make that much of a difference? I'm talking like one print turns out great for the entire duration and then I go to print again and the first layer won't even stick.
Not sure what you're even asking with the other questions about slop, backlash, and z tilt. Will have to look into those