A printing system, comprising: an image forming unit to form an image on a sheet in a colorant; a first sheet feeder (91A, 91B, 95) and a second sheet feeder (91A, 91B, 95) to supply sheets to the image forming unit; a trial printing system, which conducts a trial printing process to print at least a part of images included in a print job on a sheet supplied from the second sheet feeder when the print job designates the first sheet feeder (91A, 91B, 95); a first receiving system, which receives an instruction to continue printing after completion of the trial printing process; a main printing system, which conducts a main printing process to print the images included in the print job on a sheet supplied from the first sheet feeder (91A, 91B, 95) when the first receiving system receives the instruction to continue printing; a first non-trial printing system, which conducts a non-trial printing process to print the images included in the print job designating the first sheet feeder (91A, 91B, 95) on the sheet supplied from the first sheet feeder (91A, 91B, 95); and a controlling system, which controls to conduct at least one of a first printing procedure, which includes the trial printing process and the main printing process following the trial printing process, and a second printing procedure, which includes the non-trial printing process, when the print job designating the first sheet feeder (91A, 91B, 95) is entered; wherein the controlling system is configured to conduct the first printing procedure when an amount of the colorant remaining in the image forming unit is less than a predetermined level. an image forming unit to form an image on a sheet in a colorant; a first sheet feeder (91A, 91B, 95) and a second sheet feeder (91A, 91B, 95) to supply sheets to the image forming unit; a trial printing system, which conducts a trial printing process to print at least a part of images included in a print job on a sheet supplied from the second sheet feeder when the print job designates the first sheet feeder (91A, 91B, 95); a first receiving system, which receives an instruction to continue printing after completion of the trial printing process; a main printing system, which conducts a main printing process to print the images included in the print job on a sheet supplied from the first sheet feeder (91A, 91B, 95) when the first receiving system receives the instruction to continue printing; a first non-trial printing system, which conducts a non-trial printing process to print the images included in the print job designating the first sheet feeder (91A, 91B, 95) on the sheet supplied from the first sheet feeder (91A, 91B, 95); and a controlling system, which controls to conduct at least one of a first printing procedure, which includes the trial printing process and the main printing process following the trial printing process, and a second printing procedure, which includes the non-trial printing process, when the print job designating the first sheet feeder (91A, 91B, 95) is entered; wherein the controlling system is configured to conduct the first printing procedure when an amount of the colorant remaining in the image forming unit is less than a predetermined level.