I have been using the Bambu support material and I think it works well, but I haven’t tried using PETG yet.
When you select the Bambu support for the support material interface a box shows up recommending to set:
0 top z
0 interface spacing
Concentric pattern
Disable independent support later height
If you click yes on the box, it will set it for you.
Most of the time it is easy to get off, but sometimes it is hard, especially when it’s supporting a flat surface. Make sure to wait until the model is completely cool, otherwise it is harder to take off.
IMPORTANT: Set the flush to 700 when going from the support material to any of the PLA spools, otherwise it will mix with the PLA and potentially cause layer separation at the layer printed after switching to PLA. A number lower than 700 might work, but that is the number I am using for now.
I use the following tools to help
Strong thin point tweezers
I hardly use the tweezers anymore after getting these two pliers. I hesitated because of the price, but it is definitely worth it. Both in quality and especially usefulness.
https://www.amazon.ca/gp/aw/d/B000IBSFPS?psc=1&ref=ppx_pop_mob_b_asin_title
https://www.amazon.ca/gp/aw/d/B000IBSFPS?psc=1&ref=ppx_pop_mob_b_asin_title
I use most of the tools in this set when removing supports. They make things easier.
https://www.amazon.ca/gp/aw/d/B072HTBDK7?psc=1&ref=ppx_pop_mob_b_asin_title
A good precision blade set, like X-acto knives. I have a cheap set that came with a 3D printer combination set that I will replace so some point, so I won’t advertise it, buy something better. But it has served me well so far. I especially like this blade.
It is good for when the support material is stuck to a flat surface. I stick the pointed end between the support interface and PLA and push, which separates it at that spot. Just use the blade to start it, you don’t have to use it on the whole surface, you then use your fingers or tweezers or pliers to pull it, it comes off easily after that.