After a G28 z-axis homing, there is a final z hop.
It was hoping to height z_hop as an absolute z height rather than relative.
If the z-axis home leaves the head at a z height higher than z_hop,
e.g. because you were using a probe to do z homing,
this meant that it was z hopping in the negative z direction, which
could result in crashing the toolhead.
Signed-off-by: Joshua Redstone <redstone@gmail.com>
Add a helper function for submitting relative movements. This
function will also automatically ensure gcode.reset_last_position() is
called.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
In it's current behavior, safe_z_home will attempt to home Z if it thinks the toolhead is above the z endstop even if the motors have since been disabled and the toolhead was moved to another position
Signed-off-by: Florian Heilmann <Florian.Heilmann@gmx.net>
Instead of passing a dictionary to the command handlers, create a
wrapper class and pass that class to the command handlers. This can
simplify the command handler code.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
When overriding a g-code command, allow the caller to obtain the
previous command handler. Use this feature in homing_override and
safe_z_home.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
PR #1970 introduced a new parameter, controlling the default behavior of the safe_z_home-module. To avoid unexpected changes, the default of the move_to_previous is now defaulted to False.
Signed-off-by: Nils Friedchen <Nils.Friedchen@googlemail.com>
If '[stepper_x]' and/or '[stepper_y]' have a 'position_min' that is
non-zero, and '[safe_z_home] home_xy_position' is '0,0'; then the 'G28'
command will _not_ move to '0,0'; but stay at 'position_min' during the
Z endstop test.
This fix corrects this issue.
Signed-off-by: Jason S. McMullan <jason.mcmullan@gmail.com>
Once a hop is performed, it will only be re-issued if the z-axis has been
moved in the meantime. Usually it is only moved by a z-homing so doing so
will cause safe_z_home to do the hop on the next homing action.
When z-axis is homed, x and y positions are known. When setting this
boolean option, these are set back to their last positions.
Whenever a hop is specified it is re-issued after the Z axis has been
homed. This is especially necessary when a pressure-based probe is used.
Also, the module decides if a hop is necessary, based on either a known
Z position or a flag that is set whenever the motors are disabled.
Signed-off-by: Nils Friedchen <Nils.Friedchen@googlemail.com>
redstone99