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Glue

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Whales:
Aside: I have been using masking tape on my glass bed of my super-cheap prusa clone $300 kit printer and it has been working really well across hundreds of prints.  There is a secret that makes the difference between it being perfect and useless: soap and water.

If there is any hand grease on the tape (eg from assembling the tape or rubbing the centre print area with fingers) then the prints do not stick.  A paper towel, a little bit of water and a drop of dish detergent work wonders.  If the bed is heated then you don't even have to wipe it off.  Alcohol does _not_ work anywhere as well as soap and water, that's what I used to use and it often required multiple cleaning cycles + frustration.

PLA @ bed 55degC: works perfectly, I only ever have bed detach if there is hand grease on there.  Cancel the print, peel old off, clean bed with soap+water and re-run; so far this has always worked with once cycle.

PETG @ bed 70degC: sticks so hard I often tear bits of the tape during removal.

EDIT: take these bed temps with a grain of salt, in my design the bed thermistor is not really reading the top surface of the glass (it's on the bottom of the PCB element instead).  My actual resulting bed temps are probably (?) lower.

Photos below show a variety of marks on my tape: small (very tall) repetitive part marks in the centre, scratches around the edges from z-height getting knocked, several little tears all over the place from removing PETG.  I have replaced the centre tape line recently, so it might look a bit neater than the rest in places.  "It used to be nice and flat" :P  luckily the tape is soft and extra forgiving.

PlainName:

--- Quote --- Could the thin layer of adhesive from your glue stick be removed (slowly) with water?  Unmodified (i.e., uncrosslinked) PVA adhesives are slow to dissolve, but are not stable to water.
--- End quote ---

Yes, but the stuff that doesn't work is similarly slow to wash off.


--- Quote ---Rosin (like for soldering and violins) and shellac are soluble in ethanol, and once dry can be heat activated too.
--- End quote ---

Now there's a thought! I'll see if I have the right stuff - got some liquid flux that is super-sticky and almost impossible to remove if you spill half of it over the bench.


--- Quote ---Maybe the manufacture would be willing to tell you what the purple stuff was?
--- End quote ---

I will try and find a contact, but I have to say I won't be holding my breath :)


--- Quote --- I have been using masking tape on my glass bed of my super-cheap prusa clone $300 kit printer and it has been working really well across hundreds of prints.
--- End quote ---

Ah, I wondered about doing that and should give it a try. That will mean a bout of bed-levelling though, and it's pretty spot on at the moment.


--- Quote ---PLA @ bed 55degC: works perfectly
--- End quote ---

I'm using a thin mirror (for flatness) and 50C for PLA seemed to work well, which is pretty close to your figure.

Whales:
Could this be the purple glue stick?

https://s3-ap-southeast-2.amazonaws.com/wc-prod-pim/Asset_Documents/Gloo%20Glue%20Sticks%20Purple%20SDS.pdf

(also attached, in case that link ever goes away.  MSDS are generally publicly available documents in Aus anyway)



ie:
 - PVA glue
 - common soap
 - glycerin (probably to thicken it?)
 - coloured dye
 - water

PlainName:
Thanks for looking! I doubt if it's the same thing. The one I am after is this:


https://www.fishpond.co.uk/Toys/Uhu-Glue-Stick-Purple-860ml-Saunders/9999660083438

I just tried a BIC purple for no other reason than that it might be the colouring:

https://www.amazon.co.uk/dp/B01N9B1QEA

Same uselessness as all the other sticks.

PlainName:
Googling around I found this:

https://www.reddit.com/r/mildlyinteresting/comments/26fwcu/my_purple_glue_stick_wasnt_used_for_a_while_and/

The stick sweated, and I wonder if that's the reason it was withdrawn. So, anyway, you know how Googling goes and eventually I would up here:

https://all3dp.com/2/what-s-the-best-glue-stick-for-3d-printing/

Hmmm, Elmers. Clearly (ho ho) a USA thing but blow me if the link didn't take me to Amazon UK, whereupon I ordered this:

https://www.amazon.co.uk/dp/B08PCHSL7Y

Should be here before 10pm...

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