Switching Nozzle Probe Retract #27804
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thinkyhead
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MarlinFirmware/Marlin#27804 Co-Authored-By: InsanityAutomation <[email protected]>
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I left it enabled by default because I see it as the "Safe" option. Pulling the nozzle back would be more likely to prevent a crash than cause one. I did this in the first place because an OEM toolhead had the nozzle pushing the bed on every probe. I don't have a strong feeling either way, but it was a conscious decision. |
thinkyhead
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MarlinFirmware/Marlin#27804 Co-Authored-By: InsanityAutomation <[email protected]>
thinkyhead
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MarlinFirmware/Marlin#27804 Co-Authored-By: InsanityAutomation <[email protected]>
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In working with the Taz Twin Nebula dual extruder switching nozzle heads, we found that with a BLTouch the nozzle would often contact the bed before the probe. We wanted to keep the probe buries in order to minimize risk to damage from a failed print, so the best solution was to retract the tool head while probing then extend it again allowing larger nozzle to probe offsets.
The other issue observed when doing so manually with gcode to servo angles was when calling a tool after having modified it angles, such as a T0 in the start script, it did not restore, so this adds a servo command when old_tool == new_tool to ensure switching nozzle guarantees nozzle position when called.