RepRap for Science—How to Use, Design, and Troubleshoot the Self-Replicating 3-D Printer - Open-Source Lab: How to Build Your Own Hardware and Reduce Research Costs - page 157

FIGURE 5.57 Screen shot of Cura.
5.4 Printing for the First Time
You are now ready to print for the first time. Load the filament through the tube while the hot
end is still cold. Ensure that your motor leads are all wired correctly by (1) opening Pronter-
face, (2) connecting to the printer and using the x , y , and z controls to test directionality. Do
this in small steps—particularly for the z -axis. If any of the motors are spinning the wrong dir-
ection, turn of the power so you do not destroy the stepper driver, and then switch the leads.
5.4.1 Level the z -axis
Position the hot end to the far right of the board and move the nozzle down until it is two
paper widths from the stage. This is the home position. You can adjust this position to perfec-
tion using a combination of moving the z -end stop, the z -micropositioner ( Figure 5.58 ) , and
the bolts holding up the z -axis.