I added the scraps from my initial green ABS that came with the SD and it disolved in about 30 mins into the milky slurry that everyone talks about.

The Blue ABS blob is still just a solid lump of bubblegum.

Gomisan wrote:

Thanks guys, I've given it a lot of shaking, but I'll leave it another day or so. perhaps I put in too much ABS? It's a pasta sauce jar and the ABS blob in the bottom is almost an inch high, and it is half full of perfectly clear acetone.

Doesn't sound like too much.

Worth asking- is this pure acetone, or 70% acetone? I have never tried the lower percentage stuff, just use industrial acetone which I think is fairly pure.

But what you buy for removing nail polish and so forth is often <100%

It takes time for it to dissolve.

Thanks guys, I've given it a lot of shaking, but I'll leave it another day or so. perhaps I put in too much ABS? It's a pasta sauce jar and the ABS blob in the bottom is almost an inch high, and it is half full of perfectly clear acetone.

Doesn't sound like too much.

Worth asking- is this pure acetone, or 70% acetone? I have never tried the lower percentage stuff, just use industrial acetone which I think is fairly pure.

But what you buy for removing nail polish and so forth is often <100%

I made a 7" piece the other day (slanted) with acetone slurry.  Almost no warping, and the piece was a warpy kind of piece.
That said, I also broke my 2mm glass getting the piece off [i kind of expected that & wasn't careful enough.]

Came home hoping to have a nice 'slurry' to try out, and instead I have a big bubblegum like blob of ABS at the bottom of the jar and pure clean Acetone on top. It started out as lots of fine scrap from brims etc. Is this normal?

Do I need to leave it longer? Or is my ABS weird?

shake it up. it should mix

Do I need to leave it longer? Or is my ABS weird?

I feel chastised for using the 'glue' word!

In future I shall call the Acetone+ABS mix a banana... or was that an apple? Dammit, let it be a slurry and be done with it.

and thankyou Adrian for answering my question. I have some ABS dissolving in acetone at home, a good use for a lot of brim scrap, and I will try that tonight with my more difficult print.

For answering how to use the, ahem,  slurry.

I did say it was what its colloquially referred to - not what it was specifically in terms of a substance.. and I was trying to be helpful to prevent people talking about Apples when they really mean Bannanas... because the ABS+Acetone concoction is not the same thing as actual ABS Glue. But if you feel it should instead be called "Steve" or something - go for it... But if you look on RepRap forums or Printrbot forums.. you will see many many references to ABS Slurry/Paste.... but the ones to Glue are usually in specific reference to 'actual' adhesive solvents...

If trying to make sure you are on the same page with regard to taxonomy within the community caused some sort of offence... my apologies for trying to assist the thread with getting external or alternative information using the appropriate keywords and everyone should feel free to keep seeking info on Bannanas using 'Apples' as the search word - Or "Steve" if thats what you prefer it to be called And I'll refrain from trying to assist people to search for the right information at the right time since it seems to cause offense to people... despite trying to be a clear smart alec/jovial in my first statements

On an insanely more wasteful scale, industrial printers sometimes do this. they print on a disposable ABS tray about 1CM thick.

Wish some pedant would answer the question though!

Use a brim when you have a reasonable amount of points of contact relative to the size of the object - such as large rectangles where the disproportionate cooling of edges to centre of the print will encourage lifting. A raft may help but will leave a lower quality surface to which it is attached.

Use a raft when you have an item with a minimal set of points of contact with the bed, particularly when relative to its size and therefore adding a brim will not help relative to the object size. For example, if printing a table 'the right way up', then a raft would help dramatically compared to brim due to only holding the bed through the 4 legs vs when the 'top' is printed (ignoring the bridging challenges with this scenario ). Or the Linux Penguin on thingiverse that doesn't sit flat properly and is instead cocked on one leg...

But thats just my opinion based on what I've printed...