I recently bought a Creality Ender 3 V2. I have heard that it is best to use a raft when printing. I have tried to use a raft a few different times using PLA, with different settings each time. When I try to peel the raft off of the print, it will snap around the bottom of the print. Are there any recommended slicer settings or printer tips to help this?
I have heard that it is best to use a raft
Actually, it is not best to use a raft, a raft is an aid that can best be used in special cases, e.g. for filaments that shrink reasonably (PLA is not such a filament).
A raft always caused a rough bottom of your print and is frequently difficult to remove. A raft is an aid for adhesion if your print object geometry or choice of filament requires you to use it, but as far as printing PLA, a raft is generally not needed. You need to spend some time to level the bed properly and dial in the best nozzle to bed distance (the thickness of a sheet of plain printing paper like A4 or US Letter will work fine).
There are usually options available in slicer software to control the distance between the raft and the first layer of the print object. It is also reported that inserting a wait time to solidify/cool the raft is beneficial for creating less strong bonds between the raft and the print object.
I haven't run into this kind of issue, but I've found some tips that might help.
HAVE SOME PATIENCE
You have waited several hours for the print, but you have to wait a little more until the model is completely cool. After some cooling, the model may come off by itself. As the plastic cools, it hardens, losing the tackiness needed for the layers to adhere.
CLEAN THE PLATFORM
This may not help with current printing, but if your platform is clogged with old adhesive, then it's probably time to clean it out. Future prints may not adhere as firmly. If the print is still stuck, run it under a stream of hot (not boiling) water and carefully use a spatula to remove any adhesive on the surface.
After printing, make sure the platform is clean and inspect the surface of the steel. If there are indentations, turn the glass over and use the smooth side. If both sides show signs of pitting, replace the glass.
PUT IT INTO THE OVEN
There are times when hot water doesn't help if you have a glass or other heat-resistant surface with no plastic or electronics and you can take it off the printer, and put it in the oven. Set the temperature to 100º and then use a spatula to see if you can remove the model. If it does not work, increase the temperature to 120º, leave for five minutes and try again. Raise the temperature until you remove the model.
DO NOT USE CHEAP PLASTIC
In many cases, cheap plastic is a false economy.
MAKE SOME HOLES
By creating several holes in the surface of the print base, you can avoid sticking caused by too much surface contact.
Hope these tips help you :)
Rafts fuse with models because the filament gets overheated. To avoid this, keep the temperature in the room between between 23 and 28 °C. Malfunctioning extruder fans, a heater & thermocouple, extruder printed circuit board (PCB), extruder cable, and motherboard can be also to blame.