On Thursday 30 July 2020 08:26:14 Bruce Layne wrote: > The various build surfaces are good for an introduction to 3D > printing, but I've found them to change considerably over time with > wear. This results in a variable that prevents a consistent process. > Quality is achieved by doing the same thing, the same way, every > time. That's why I've consistently urged you to switch to a glass > build plate, preferably borosilicate glass, with a very thin coating > of glue stick and water. The water evaporates leaving a very thin > layer of glue that provides a uniform and consistent build surface > that's strong enough to prevent even ABS from warping and separating > from the build surface. When the bed cools, the parts self release. > There is no scraping or gouging that can not only damage a build > surface but also knock the bed out of level. These are relatively > delicate little CNC machines. Hacking and prying with a putty knife > is not conducive to repeated success or machine longevity. > > The first thing I do with a new 3D printer is preheat the bed to 110C > and peel off the plastic build surface, leaving the adhesive on the > aluminum build plate which I use to adhere a new glass build surface. > There are also clips that can be 3D printed to secure a glass build > surface to the bare aluminum built plate.
And since the ender-3 is bigger, meaning the non-magnetic peel and stick glue coated pads that come with the PLA are both too small, and covered with a peel and stick bottom which would preclude removing it from the plate once cooked into place, where do I obtain a kit to convert it thats known to be "the right stuff"? Adhesion was such a problem that I kept raising the bed and extruder temps for the first layer until it did stick, sliced all the parts when I found that magic set of figures 73 and 225, then dropping to 60 and 215 for the build. 215 is top end for this "Overture" brand of PLA. And now its sticking so good I've had to toss pad and part in the freezer to get the part off the pad, then scrape the thin brim off by hand and a used jointer knife which laid flat, gets under the majority of the brim. There is sharp and there is sharp, and a jointer knife redefines sharp, particularly if its been re-sharpened on my wet rouge wheel as its a 12,000 grit. I should probably bring the sd card back to here and edit that code for lower temps now. The lack of instructions that come with these things is amazing and frustrating. I had to remove the tab on the z switch to lower it another 2mm in order to get enough spring tension to make the plate levelers actually work. The extruder setting OOTB was about 20% of what was needed to get 100mm of string for a 100mm feed. That I think I may have overshot and am turning it down slowly, very slowly. The original xy scales may have been good, when I got the extruder to lay enough that 5x5 cube measures around 5.09, 10.07, 15.07, 20.06 and 25.08, note the lack of a linear coorelation. Stepper motor granularity that a better driver might fix? DamnedifIknow. Both are currently set at 80.10/mm. About 1% above OOTB. > On 7/30/20 7:40 AM, Gene Heskett wrote: > > Greetings all; > > > > I gave up putting off sleep and with the last of 3 motor top plates > > 88% done, went to bed around 2ish, knowing it would be done and cold > > by the time I woke up, which it was. > > > > But the magnetic sheet used for a build surface was welded to the > > hot plate pretty bad, and by the time I had gotten the putty knife > > under it and pried it loose, and lifted free, both the bottom of the > > mag sheet and the tan pad glued to the build plate were surface > > damaged. Has anyone else encountered this? > > > > As time and use have gone by, part adhesion to the build surface has > > improved to the point the brim has become permanently stuck, > > sometimes coming off with the next part so that hasn't been a huge > > problem yet, but is that how it works, making the whole build plate > > an assembly one should keep on hand? > > > > Thanks. > > > > Cheers, Gene Heskett > > _______________________________________________ > Emc-users mailing list > [email protected] > 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
