Glass bed on Ender 2 pro

[cmhodgson]

I like the build-tak-like bed that came with my Ender 3 pro, however because I have a significant dip in the center of my bed it is impossible to level. I've tried shimming with sticky notes and that works OK. I think I've reached the end of life on the surface as I now have to put glue stick on it to get a reliable hold, and that glue then has to be washed off the parts. Many people seemed to like a glass bed so I thought I would try it, and ordered a Creality glass build plate. At least it is flat, but none of my filament will stick to it reliably without some glue stick. With the Glue stick added, parts have to be pried or hammered off, unless they are tall enough to give some leverage. I've tried water or alcohol, on the glued pieces, with little improvement. Many people suggest that their parts just pop off the glass as it cools, but I have had no such luck. I print with filaments.ca's "Econofil" the most, it works great for me on the non-glass surface. I also have Hello3d's silk and shining filaments, and some other "standard pla" which is supposed to be based on Ingeo 4043D ... none of this sticks without glue, and it sticks way too well with glue. I print at 200/60 for most pla, and 220/60 for the 4043D. The first layer of filament lays done nicely on the bare glass, and wont rub off, but if you get your nail under it it pops up and the whole things will peel off with little pressure. The result is that if any small corner lifts a tiny bit as it is laid down, the whole thing will eventually come off. Also once it gets a bit higher the leverage of the nozzle moving around will tip it over. With the glue on the glass it is hard to peel up even a single line of filament as is stuck down hard and shows a white residue where you've peeled it off. I've already bought a new Creality magnetic build surface to replace my old one, but I still wonder why I cannot replicate other's results on glass. For extra fun, it seems the polarity of the magnetism of my new magnetic bed is off by 90 degrees so I need to either cut the convenient lift-handle off the new plate, or peel off and replace my entire magnetic surface ... does anybody know, if the direction of magnetism is just random? Do I have a 50% chance of having to do this every time I buy a new one? In that case I may have to buy several at once so I can use the same-way magnetized ones first ... ugh. Thanks for any tips for sticking to glass!