M98 R1

var eAxis = -1

while var.eAxis == -1 && iterations < #move.axes
  if iterations >= #move.axes
    break
  if move.axes[iterations].letter == global.mmu_extruder_axis
    set var.eAxis = iterations

if var.eAxis == -1
  abort "Cannot find endstop axis: " ^ var.eAxis

var eAxisTriggered = sensors.endstops[var.eAxis] != null && sensors.endstops[var.eAxis].triggered
if !var.eAxisTriggered
  M98 P"mmu/lib/disengage.g" ; disengage the selector so that filament can be pushed in.
  var errmsg = "Expected selector to be loaded but it's not!"
  echo var.errmsg
  if state.status == "processing"
    M291 P{var.errmsg} R"Check Selector and click continue to try again." S2
    M98 R1
    M226
  else
    abort "Selector/Filament endstop is is not triggered"
M98 P"mmu/lib/engage.g"