Queengl
1
After successful 8 he print last night, came in, pulled parts off bed. It had been cold for ~ 10 hrs. Cleaned glass with acetone, scraped crud off with steel putty scraper like many times before. Preheated (FF Creator Pro; ABS; 233C/115C). Prepped bed with fresh coat of ABS/acetone juice. 10-15 min later, launched 3 hr print. No problems, looked great when it finished. Left it on bed for ~1 hr. When I pulled it off, there was a blob of jelly on my raft. Blob on the print bed too. I touched it, it was cool but squishy. The raft was very difficult to pull off, but the part was good after a little sanding. ~ 2hrs later, came in to clean up and launch next print. The jelly wasn’t jelly anymore, it was hard, it was rough, it was a crater in my glass. Nothing above the plane of the bed. Amongst the shreds of raft left on my workbench, tiny shards of hard brittle glass. Closer inspection of bed shows more pits where the ABS raft touched the bed. Can ABS break down into acid? Any ideas?
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I wish there was a video of a squishy blob arising out of glass, ABS, and ABS juice. That mustve been unreal to feel that squishy thing. When I printed with those materials I only managed to bond the print to the glass, breaking it, and getting the object with a layer of glass attached. Pictures or video?
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Queengl
3
Attached is a picture of the bed. It was pretty weird, it didn’t wet to my finger at all, kind of like silly putty or something. I cleaned it off real good and put one of the blue FF bed liners over it and did a 12 hr print with the same filament. The raft was stuck to the liner so bad, I had to use acetone and a scraper to get it off. Now there are depressions in the blue liner where the raft lines were. I think I’m going to pull this spool and cut my losses. I have searched and found only a couple of references to this type phenomenon. Neither of those seemed to catch it in the jelly state. Talked to a chem. engineer and he said it was impossible. I feel like a saw a UFO or something.
Perry_1
4
I am not sure what combination of events created what looked like jelly to you. Certainly the glass did not melt.
I assume this is an older borosilicate glass plate. Over time, it will degrade from heat/cool cycle. It finally gave in.
I have had the same issue with both my older glass plates. They just give up and start cracking as they age.
If this is a newer bed, with very few hours on it, then you should contact FF for a replacement. If you have hundreds of hours on it, then it is nothing but age.
One other note. IF YOU ARE REALLY, REALLY CAREFUL, you can put your prints in the freezer after they cool a little. The ABS will shrink faster than the glass, and the print will slide right off. HOWEVER, this also would likely shorten the glass life, but it wont break the glass when you try to remove a print.
Buy a floor tile cut to size use ABS juice
Using a floor tile is a terrible idea. Heavy, glaze will chip, ceramic not good for heat and reheat, so no, dont advise that.
Wish I had of known 3 mths ago ,Best thing I have ever tried,cost nothing as well
OK, I’ll bite. Can you post a picture of the floor tile, cut, on your printer?
I work in ceramics. Floor tiles are not flat like glass. They may be smooth, but the do not come out of the kiln flat…
