more work on buffer.insertPreheatCommands
more work on buffer.insertPreheatCommands

markwal/CuraEngine,Ultimaker/CuraEngine,ROBO3D/CuraEngine,pratikshashroff/pcura,ROBO3D/CuraEngine,totalretribution/CuraEngine,Ultimaker/CuraEngine,markwal/CuraEngine,pratikshashroff/pcura,totalretribution/CuraEngine,pratikshashroff/pcura,alephobjects/CuraEngine,markwal/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,totalretribution/CuraEngine,alephobjects/CuraEngine