How to make a very sticky glass printing bed without any additive by jlcdi

Last crawled date: 3 years ago

The problem I tried to solve was that my new perfectly flat printing bed in borosilicate glass was not sticky at all for PLA.
I didn't want to use the sticker papers anymore because the rendering of the surface of the objects in direct contact with the glass is so perfect !!!
I then had the idea to cross sand one of the faces of this glass sheet with 600 sand paper. If the thin scratches are almost invisible (and not visible at all on printed objects), it immediately appeared that they produced a huge effect and gave a strong adherence to the PLA filament on the glass surface.
I exclusively used this sanded glass sheet since, and it worked 100% great every time, always remaining very sticky for PLA provided the glass sheet stays at least at 50°C (I use 228°C for the PLA filament, and 60°C for the printing bed).
Heating at 60/70°C, a huge adherence appears without the need for any glue or whatever else. Just the bare sanded glass sheet. And, magically once the printing bed becomes cold, every printed object, whatever is the size of its surface, just spontaneously separates from the glass surface. No efforts, no tools needed, just remove it as simply as you would take an object placed on a shelf.
I do not know if it is important or no, but just in case, I kept avoiding to touch the surface with my fingers in order to prevent the presence of any oil which would reduce the adherence of the scratched glass. Anyway, there is no need to touch it because as previously said, the objets spontaneously separate from the printing bed once the glass surface becomes cold.
A very interesting and positive side effect of this spontaneous separation is that there is no need to readjust the level of the printing bed once it is even, because there are no efforts to apply on it to unglue the printed objects, so no possible disalignments at this step.
I simply wanted to widely share this successful try, because I know that many are in deep trouble with this adherence issue.
To date, I did not try with any other kinds of filament with this printing bed. I'll update later. However if you can give an update based on your own attemps with this solution or an approaching one which may be helpful for others, you are warmly welcome to add it in the comments.
The uploaded file comes from another of my Things, and is useless. It is here just to allow the publication of the present information.
I hope this tip will be as helpful (life saver ?) for you than it have been for me.
Have a good day !