[Feature request] Adjustable Z-hight

[314159-r]

Adding setting options for printing Z-hights would be nice (for Prime line and Blob). Perhaps in the "Test Configuration" section.

When running this flow-test with PCTG filament on my Creality K1 printer, the nozzle tip gets dipped into the extruded plastic. Both in the prime line, and the blob. It got a bit messy, not catastrophic, but it doesn't appear ideal...

The prime line is currently printed at Z 0.3 mm. But when I measure the printed line, it is 0,9 mm high. So the nozzle tip is 0.6 mm below the plastic surface, plowing its way... The same problem occurs in the blob. The current Z start height is 0.5 mm, and with the default Blob Height setting of 10 mm, my nozzle tip gets buried in plastic in the start. Increasing the Blob Height setting would probably help a bit, but starting of from a higher Z would be better.

I made some test prints with manually edited G-code, where I increased the two Z-heights to 0.8 and 1.0 mm, that turned out well.

I haven't tested with other filament types yet, and it might very well be that PCTG have a "different" viscosity that requires some adaptions.