![]() ![]() Z offset can be 0 but practically a small offset of around 0.1mm takes into account the upward movement of the nozzle (and hotend) which is required to trigger the probe. With the piezo hotend probe x and y offset is always 0. This can be compensated for in software, and can be minimised by good mechanical build and optimal mounting of hotend and probe, but it does cause problems and compensation in software manually requires time. On a delta, effector-tilt an inevitable consequence of mechanical imperfection, means that an offset probe is either fractionally closer to the bed relative to the nozzle or further away depending on the x,y coordinate. At certain nozzle coordinates the probe is out of the bed due to its x/y offset and cannot probe unless the frame/axes are much larger than the printbed, which is unusual. On a cartesian/corexy machine there is a often a limit to the bed area that can be reached by the probe for the purposes of bed levelling/compensation. Other common probes such as an IR probe, inductive probe, capacitive probe and deployable/servo probes are physically not using the nozzle as the probe, and therefore have offsets in x,y and z. Having no probe offset from the nozzle.Being able to determine by probing directly where the bed and this point intersect is theoretically the most accurate method of calibrating/levelling/z-homing, although few modalities so far have achieved this in practice. The nozzle in a 3D printer is the tool, and the nozzle tip is the point in space that the coordinate system describes.Most of these aims are self-explanatory but the advantage of using the nozzle as a probe should be explained: Is permanently mounted for convenience and improved reproducibility. ![]() Uses the nozzle as a probe and therefore has no x/y offsets and minimal z offset.Accurate to 0.01mm or better and reproducible.The aim was to devise a z-probe which was: Some are more accurate, convenient and useful than others. There are many z-probe technologies in use in 3D printing, ] however each has its advantages and disadvantages. ![]()
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