So I bought a used Mrk3s+ with e3D rapid change nozzle. When I bought the printer and the the previous owner did a test print it work perfectly. However when I tried to do the first layer calibration globs keep building up on the nozzle. Is this a sign my z offset is too high, too low, or some other type of problem.
Likely too high. I'd suggest cleaning the bed too.
Doing these two things have helped alot improve first layer quality but I still have adhesion issues with some prints coming lose during print. Would this imply that the Z is too high? I have slowed down printing speed, increased heat, and layer thickness as well for the first layer.
So I ended up lowering the z offset even further, increasing the bed temp for the first layer, decreasing first layer print speed, increasing first layer thickness, and increasing bed temp for the first layer as well and so far things have been working great.
Building would imply it is too low and you are dragging the nozzle through filament. Pics would be helpful.