Manually Change the Filament Type That the Printer Thinks That it Has  

RE:

Might be over-thinking it. I've never worried about printing PLA after PETG. The temp difference is not enough to worry about it. The PLA should push out the PETG at PLA temps. 

However, I can think of a bunch of ways to do this (in no particular order)

1. Filaments -> Manage Filaments -> Edit Filaments -> USER1 
   1. Set the name as PLA 
   2. Set Visible to "on"
   3. Set your temperature to a PETG temp, like 230°
   4. Save 
   5. Load your PLA using this filament
2. Filaments -> Manage Filaments -> Edit Filaments -> PLA
   1. Change temp to 230
   2. Save
3. Load PLA as normal
   1. Control -> Temperature -> Nozzle Temperature
   2. Set for 230°
   3. Filament -> Purge Filament
   4. If #3 tries to lower the nozzle temp before the purge try: Control -> Move Axis -> Move E
4. Purchase cleaning Filament
   1. Run cleaning filament through at PETG temp or higher
   2. I generally do this after print Nylon or Polycarbonate
5. Have separate nozzles for different filament types. A friend of mine does this, don't know why...

RE: Manually Change the Filament Type That the Printer Thinks That it Has

Thanks, for these.  However, changing from PETG to PLA was just an example.  I'd like to do this whenever I change from a higher temp filament to a lower temp filament. Alas, there does not seem to be any generic way to do this.  It is just another example of  how my MK3S+ is easier to use than the Core One.

RE:

Posted by: @struttmann

Thanks, for these.  However, changing from PETG to PLA was just an example.  I'd like to do this whenever I change from a higher temp filament to a lower temp filament. Alas, there does not seem to be any generic way to do this.  It is just another example of  how my MK3S+ is easier to use than the Core One.

I print a lot of high temperature filaments, eg 270-290° and quite often switch to PETG or PLA without giving it much thought. For one I don't use HF nozzles. Also, I will occasionally run cleaning filament through the nozzle, especially if I'm switching colors with a high contrast difference. Otherwise, I have yet to experience a serious clog. 

If you are concerned, I would just buy some cleaning filament or pick up a roll of Nylon or HIPS