When you open your slicer, the mock printing plate has a grid on it, which is quite handy when you want to create specific alignments, but let’s say you want to apply your glue exactly where needed, as opposed to “about from here to there”. A reference grid, maybe made out of transparent plastic and held on one edge with magnets, would be a nice accessory to have when prepping the plate?
There are a number of build plates on both Amazon and Ali Express that have the grid embedded on the plate. I just purchased one with a texture. Note: I do NOT recommend this plate as it has poor layer adhesion and I will likely send it back. However, it is an example of what I speak of.
Alternatively, you could do what I did with one of my build plates and that’s apply your own markings via a piece of painter’s tape on the edges or using and acrylic market.
Another alternative is to use a cube primitive and print a grid with no top or bottom layers. Then modify the grid dimensions and print out a sample on your build plate vs what you see on the screen. Then print it and do not remove it first and then use an acrylic pent to mark parts of the grid near the edge.
I’m not really fond of altering the existing plates in a permanent way. That’s why I was thinking of a plastic sheet that you just use as you prepare the plate, then remove and reuse later. It’s something BBL could pull out easily.
If I had a dollar for everything BBL could do easily…
And yet nothing changes does it? The bottom line is that unless one can show to Bambu that it sells more filament or printers, it simply ain’t gonna happen. 
For Bambu Labs, it’s “Chabuduo” (差不多) all the way!!! 
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Seems like any plastic sheet or grid that covers the plate will obstruct the area where you want to place glue.
Mark edges of the bed every centimeter, then use a ruler on the plate to provide a guide line.
This would be a lot easier if we had a way to create the tools we imagine 
…
Though I do not see a need to apply glue “exactly”. A little excess does not hurt anything, and a single application is usually good for multiple prints of differing shapes.
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in the (very) limited defense of Bambu.
I have been a consultant since… well lets just say a very long time.
I used to accept any change request, as long as it came on a change order. As a person that worked with pretty much every segment of client companies, I got change requests often, as a person who just got things done, I was often seen as the resident hammer (to all the problems that were nails).
First time I turned in a bill with 8x the original cost in change orders, I ended up talking to the entire board about it. Sorry, not my monkey not my circus, if ya ask me to do it, I give a price, you agree, then I do the work. Price applies. Brother I will wash your car, but the rate is still the same.
I ended up changing that policy, any change order that exceeded15 minutes requires CTO approval.
Why? well, it certainly wasn’t because I did not like the money, I had a client lets just say they are big and blue. They had one of them 25x original bid in change orders… I had a lovely paycheque that quarter… However I realised about halfway. I was being paid to do and undo, and redo things. I was paid by one group to get the ac level in a lab brought down so they wouldn’t have issues with all the servers on. Then a week later… “hey, can you get engineering to bring the temp up in here. it is freezing” I did explain the whole thing over and over, but… I am simply a vending machine of work. Insert coins, things get done… In most corps this is a problem.
Now Bambu is the consultant, and we are all the change order wanting people… But we ain’t paying by the hour…
I have heard from a little birdie that BIQU is dropping exactly a PEI plate like this in about a month.
Oho… color me very interested 
I would be up for that!!! 