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I'm pretty new to printing PETG, and my Creality Ender 3 now has a glass print bed. I've done some research, and it looks like a pretty bad idea to try and print PETG on a pure glass surface for fear of the print pulling chinks of glass along with it.

So, I've looked into various bed adhesion options. I've already used blue tape, but I'll need to purchase some wide stuff, and in the meantime, I want to investigate using PVA-based glue stick. However, one question does come to mind: how can I set the bed-nozzle distance after applying the glue stick layer?

Do I even need to? Will the extruded plastic just crush it into the build plate without a problem, saving me the trouble of lowering the build plate? My normal method of sliding a paper sheet under the nozzle at Z = 0 mm would take the glue stick layer along with it if I tried that.

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How much glue do you put on it? I use PVA based spray, barely visible, very evenly spread and no problem whatsoever of sticking paper to the glue layer.

Just level the bed as you normally would and apply a sparsely coat of glue, preferably from a spray can.

Having printed literally kilometers of PETG on various build platforms (various glass sheets with or without PVA based glue, Aluminium and PEI), chipping of glass is not something I have seen happening. Perhaps is very low quality glass is used, chipping may occur. Whether your glass is of decent quality can be tested, just print on one side, and if it chips you always have the other side. Printing on PEI with PETG is another chapter, PETG just fuses to PEI and is very difficult to remove, a PVA based glue helps, but still prints were very hard to remove.

Invest in a can of build plate adhesion spray, it lasts long, never gives you problems with adhesion and probably is even cheaper than glue sticks (per mass unit).

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    $\begingroup$ Not if you "liberate" glue sticks from the supply cabinet at work :-) $\endgroup$ – Carl Witthoft Feb 1 at 15:53
  • $\begingroup$ Which is how I intended to do it. Is the layer height of a glue stick application negligible? $\endgroup$ – ifconfig Feb 1 at 16:01
  • $\begingroup$ @ifconfig Unless you apply a lot of it, it should not be a problem. To get proper adhesion, you only need a very thin film. That is easy with a spray can. Sometimes you see pictures on the web where people use too much glue stick, that is not necessary. You can also use strong hairspray. However, some are better than others and not all brands are the same over the world. I'm using 3DLAC for several years now, that is very good spray. $\endgroup$ – 0scar Feb 1 at 17:05
  • $\begingroup$ Hrm, so I see. But you're saying that even if I want to use my giant collection of glue sticks, I should be okay without lowering the bed as long as I don't apply a super thick layer? $\endgroup$ – ifconfig Feb 1 at 18:12

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