On Tuesday 21 July 2020 13:36:53 Bruce Layne wrote: > On 7/17/20 6:03 PM, Gene Heskett wrote: > > ...added 5.00 to the extruder feed, and gave it another go. After > > 4 restarts it laid down the first two layers of a raft, with no > > missing lines and only one little bump, all while running at 20 lb > > paper clearance, so the lines it was laying down were about 50% > > coverage, but no missing gaps because it ran out of PLA. > > Rather than adjusting the extrusion rate to get a good first layer at > the nozzle height you used to level the bed, I'd first calibrate the > nozzle to extrude the correct amount of material. Andy described how > to do this earlier in this painful saga, where you mark the filament > 120mm back, have it extrude 100mm of filament, measure how much > filament it actually extruded, and then adjust the extrusion > multiplier until it's extruding 100mm.
I have done that, and my currant setting is maybe 2% more. And ut 1o hour and 23mm up on a wave gear for a harmonic drive, and except for using more PLA in the central support for what will be the bottom of the coffee cup, its rendering beautifully. I was not aware that I could fine tune the flow. At std flow, 75-bed and 235 nozzle, adhesion is a bit strong. 2 layers up it switches to 60/220 and I may edit the second copy down to to 70/230, droppiing to 60/215. > Once the extrusion rate is > properly set, leave it alone. Fix the first layer adhesion by > tweaking the nozzle height using the bed leveling nuts, or by > adjusting the first layer height and/or first layer extrusion > multiplier in Cura. > > Your 3D printing experience has been needlessly difficult. Maybe the > default settings were grossly incorrect when you received your 3D > printer but that's very rare these days. Most people don't mess with > the basic settings. Most of us get a new machine, level the bed and > start printing. There is generally a little bit of a learning curve > getting good first layer adhesion on your first 3D printer, but none > of the ongoing problems you've experienced. That sounds like hobby 3D > printing ten years ago when the burden was on the hobby builder. > These days, 3D printers are built in factories and are almost consumer > appliances with no need to adjust basic settings. It's as if you > bought a new car and it idled rough so you are building your own > engine computer to fix it. > > I'm cheap, but I've learned that there is value at every level and > it's usually the case that saving that last 10% is a negative value > proposition. I buy low cost items but usually not the lowest priced > item, particularly on something as complex as a 3D printer. I don't > want to spend $220 on a 3D printer that was built in small numbers by > people with little experience with 3D printers, who may not have > configured it properly, used the very lowest quality components with > no warranty or customer support, when I have a much better experience > by spending $30 more. If I need to spend $150 and three weeks of my > time fixing problems, saving $30 was a bad deal. > > I just finished 3D printing 4kg of ABS parts for a small production > run for a friend. I did have two clogged nozzles but those are now an > easy three minute one dollar repair. I put another 3D printer into > service in my small 3D print farm and the set screws backed out in an > X axis idler pulley so I had to fix that. I'll Loctite and properly > torque the set screws on all of my 3D printers to avoid that failure > in the future. Otherwise, that 430 hours of printing those 132 parts > was pretty much a matter of picking a part off the glass plate (they > self release when cool in 15 minutes), adding a tiny amount of glue > juice, distributing it on the glass plate with a nylon bristle brush > and selecting Print Another Copy. Once your 3D printer is adjusted > properly, hardware and software, it should be reliable. > > I'm getting better with FreeCAD and I always preview the job using > Simplify3D after slicing it. Cura allows previewing too, so you can > ensure that it's printing what you want, the way you want it to print. > > I hope your 3D printing becomes a lot easier and a lot more fun soon, > Gene. It shouldn't be this difficult. I wish you could start fresh > with a known good configuration. Its getting that way. I'm doing way more hours of printing than I am fiddling and I'm not adjusting anything until I have tried the bearings for fit in their pockets. > The only time I use a raft is when I'm printing a large number of very > small parts with little contact area on the build platform, where any > part that failed would ruin the entire print job. Glue on glass makes > a reliable first layer adhesion with ABS, PLA or TPU. > > > > > > > _______________________________________________ > 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
