; this loads the provided tool. Syntax: M98 P"mmu/lib/load-tool.g" T<channel number>
M98 R1 ; allow this macro to be paused.
if global.mmu_selector_pos == -1 && (!exists(param.H) || param.H != 1)
  abort "Home selector first"

if !exists(param.T)
  abort "No Tool selected"

if global.mmu_selector_pos == param.T && global.mmu_extruder_loaded ; if we are already on the selected Tool AND the filament is already marked as loaded
  echo {"Filament already loaded into tool " ^ param.T}
  M99 ; End Macro here, equivalent to "return" in Java

echo "Switching to T" ^ param.T

if global.mmu_extruder_loaded ; if we still have filament loaded, unload first.
  M98 P"mmu/lib/unload.g"

if !global.mmu_extruder_loaded ; check if we are unloaded now. Then: 
  M98 P"mmu/lib/generated/home.g" ; rehome to prevent compounding drift.
  M98 P"mmu/lib/generated/select.g" S{param.T} ; Move to new position...
  M98 P"mmu/lib/generated/load.g" ; and load filament from the new position.