I am using a Flashforge Creator Dual Extrusion 3D Printer with RepG (ReplicatorG), and tonight a print completely detached from the build plate.

I reset everything and watched it closely. It is a simple abs print at 230/110 degrees.

A few seconds after start of print, I noticed that the print bed temp had dropped to 109... and kept dropping.

This is new behavior. I haven't started to troubleshoot yet. I am looking for suggestions on how to troubleshoot the issue.

Edit 1:

I'm running sailfish 7.7 on the printer. Initially RepG would not connect to the printer. I reseated the USB cord and now it does.

The test print is ABS at 230/110 from this open scad.

difference()
{
    cylinder(d = 10, h = 2);
    cylinder(d = 9,  h = 2);
}

Pᴀᴜʟsᴛᴇʀ2/Oscar Once the print starts the print bed begins cooling. It is cooling before any filament is laid down.

Edit 2:

Examination of the gcode shows the root cause. It does contain

M104 S230 T1 (set extruder temperature) to set the first printer head,

It did not have a

M109 S110 

to set the build plate temperature.

When I manually add the M109 to the gcode file, the model prints normally, and the build plate temperature holds for the duration of the print. The drop in temperature last week is due to the fact that I tend to preheat the printer before actually starting the print.

There isn't a hardware issue here. I will needed to look into the software configuration issue.