On Monday 10 August 2020 10:17:47 Stuart Stevenson wrote: > This may be a dumb question. > Is it possible to use two glass plates so you can let the parts cool > outside of the printer while printing the next part?
I don't see why not Stuart. I've been clamping with spring type clothes pins, which the extruder can slide out of the way if needed, main reason I've not done it yet is I've not yet cleaned the 2nd plate. They seem to come with a film that rejects water, and it takes several scrubs with barkeepers friend and rinsed well to get rid of it, then of course the adhesion goes wild & won't let go w/o a fight. When this one is done and down to 30C, I'll drop an ice cube in the cup just for grins. That glass is supposedly clean. I just Bar-Keepers Friend'ed it again. I'll increase the bedspacing about 1/12 turn before I start the next one. And add 2.0 to the extruders feed scale, which is less than a 1% change. I can still shine a light thru a millimeter of wall build. Not yet water proof IOW. Needs enough plastic to be opaque. But an ice cube in he cup at 30C did loosen it in about 15 minutes, that's an improvement. > On Sun, Aug 9, 2020, 10:42 AM Bruce Layne > <linux...@thinkingdevices.com> > > wrote: > > On 8/9/20 10:19 AM, Gene Heskett wrote: > > > The different support base came off the glass, not easily but a > > > bit > > > > easier than the previous run. > > > > PLA is generally considered to be easier to print but If you printed > > in ABS, the higher thermal expansion rate (that can cause warping or > > delamination problems when printing) ensures that the parts will > > self release from the glass bed when it cools. Around 15 minutes > > after the print has completed, you'll hear what sounds like glass > > cracking but it's the ABS popping loose from the glass bed. The > > cracking sounds continue for another 15 minutes. After > > approximately 30 minutes the ABS part is completely separate from > > the glass bed. There is no scraping or prying needed. These > > violent acts can knock a bed out of level and cause print problems > > on subsequent prints, and could even damage the delicate motion > > control components on a 3D printer. > > > > I'm currently running a 100 part 3D print job. Each ABS part takes > > three hours to print. After 3.5 hours, I pick the part off the bed, > > squirt a couple of milliliters of glue juice (water with a small > > amount of dissolved glue stick) onto the glass bed, evenly > > distribute it with a nylon bristle brush, and select Print Another > > Copy. Easy peasy. > > > > PLA doesn't self release as well as ABS, but you should be able to > > squirt some water around the periphery of the part and it should > > dissolve the glue that bonds it to the glass build plate. Give it > > 30 minutes for capillary action to float the part off the glass bed. > > Even with ABS, I'd recommend 30 minutes for the glass plate to > > cool. PLA has less contraction when cooling than ABS but the > > contraction will still greatly help reduce the bond strength between > > the part and the glass bed. > > > > Very little glue is needed. I have best results when I can see only > > a slightly hazy glue layer on top of the glass. I think it helps to > > use a nylon bristle brush to scrub the old glue and new glue water > > into an evenly distributed emulsion. That's a few seconds well > > spent to ensure a strong first layer bond. > > > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
