STEP 3: Locate the line that sets the Extruder axis and copy the value in the line as shown below.
STEP 4: Add the line ‘M106 S100’ to turn on the fan and set the fan speed. This line might be missing in the g-code as the fan is not turned on for the initial few layers to improve bed adhesion.
STEP 5: Save the g-code file and print it to resume your print from the Z height. Make sure you clean off any blobs of material left behind by the nozzle on the top of the print.
For Simplify 3D:
The method of recovering a print from Z is easier with a Simplify3D generated g-code.
STEP 1: Locate the layer height to resume the print from and delete the entire g-code before that layer.
STEP 2: Make sure the bed and extruder temperatures are set to the correct values on the printer.
STEP 3: Save the g-code file and print it to resume your print from Z.
Also, if you know the exact height from which you want to start printing, you can also use the ‘start printing from height’ feature in Simplify3D.
Go to > Edit Process Settings> Advanced> Layer modifications and set the height.
Although these are very effective methods to save a print, an irregular/odd layer might be visible at the height from which your print was recovered. But this can be easily sandpapered to make it smooth.