I generally only use my printers for PLA, and my Prusa retracts the filament after use, so I can load a new filament.
As Bambu printers cut and retract filament, leaving some in the nozzle ready to be flushed out upon next load, what do I do if I have, for example, used PETG for a print, and then want to load PLA? Do I just load as normal and the printer will flush out the PETG and load PLA even though the filaments use different temperatures? Or do I need to do anything else?
I think you should set what filaments you want to use from bambu slicer. I think it will automatically do the rest. Just like if only one nozzle with ams.
In my case, the Sunlu PETG I purchase actually uses the same temperature as Bambu PLA. I’ve seamlessly swapped between them. However, before I started using Sunlu, I was using another brand that required a higher temp. The way I have (so far) avoided clogs is that I load up the new filament (PLA), but I tell the printer it’s still PETG so that it heats up to the higher temp. Once it flushes all the PETG out, I switch it back to PLA and print as normal. Is that the best way? Not sure, but it worked for me. Once I switched to Sunlu, I don’t need to do that as it tends to work fine at the same temp as the bambu pla. Your mileage may vary.
I frequently switch between low-temperature and engineering-grade materials.
There are occasions when flushing the nozzle is advisable, but in most cases you simply select your next filament, slice the model, and let the machine handle the process. However, when transitioning from engineering filaments to low-temperature ones, always monitor the chamber temperature closely. Attempting to load, for example, PLA too soon after printing ASA for several hours can easily result in a severe clog.