Printer nozzles cool down then heats up again prior to printing  

RE: Printer nozzles cool down then heats up again prior to printing

**Update**

Wanted to give a detailed description:

1.  I do a preheat from the printer's screen.

2.  Send the gcode from PursaSlicer to the printer via PrusaLink.

3.  Once the file is done uploading the printer activates, loads a nozzle into the carriage, does a little movement calibration then sits in the 0,0 origin while only the nozzles cool down to 70.

4.  After being cooled down to 70 for about 2-5 minutes the printer finally reheats the nozzle to only 170.

5.  At that point it will start the bed leveling function.

6.  Then parks the nozzle and shuts the nozzle temp to 0 (zero).

7.  Finally after all nozzles are in park position for about a minute the carriage picks up a nozzle and begins to print with the temp set at the sliced temp.

Is this normal?  When I printed the benchy from the USB flash drive it did not perform in this manner.

RE: Printer nozzles cool down then heats up again prior to printing

70 is the default Idle Temperature for filament so I assume it's that setting doing things while your nozzles are technically idle. I wouldn't even preheat since there are already baked in preheating startup steps; many people complain about this even. You can always just change it so the delta isn't too far from 170 if you really want to. I've just turned off Idle Temp as well as Ooze Prevention so all my nozzle stay at temp to reduce potential tool swap downtime.

170 is the temp for the bed leveling process for a few filaments. So this is normal.

When a tool is parked the printer will show zero because there is no tool in the selector; that is not the actual temp of a tool. This is normal.

After the MBL, the XL will park the tools while they heatup. Then the print will start. This is also normal.