On Sunday 16 August 2020 18:41:50 Gene Heskett wrote: > On Sunday 16 August 2020 18:24:03 John Dammeyer wrote: > > -----Original Message----- > > > > > From: Gene Heskett [mailto:ghesk...@shentel.net] > > > > > > > Mine's a CSTAR P802M bought back in December 2015. Has problems > > > > but overall is like my table saw. I go up to it. Turn it on. > > > > Use it. Turn it off. I've probably printed almost 1000 parts of > > > > various types with it now. > > > > > > > > I added a glass plate and underneath placed an insulating pad > > > > bought at Home Depot used for preventing burning wood when > > > > soldering water pipes. > > > > > > > > This is what it looks like. > > > > https://www.banggood.com/TRONXY-P802M-DIY-3D-Printer-Kit-220+220 > > > >+2 40mm > > > > -Printing-Size-Support-Off-line-Print-1_75mm-0_4mm-p-1149546.htm > > > >l? akmCl ientCountry=CA&&cur_warehouse=CN > > > > > > Looks a hair better than an Ender 3 Pro, with dual z motors. Looks > > > like the extruder motor is in the carriage? I like that too. I > > > don't like the spool sitting on the table though. And at that > > > price, I might get one anyway. > > > > There are two philosophies with 3D printing. One is you move the > > extruder motor around with additional mass and vibration for short > > motors. The other is the Bordon tube where the motors push through > > the feed tube. > > > > Vibration verses a certain amount of flex in the supply tube that > > then results in spring tension. So when you don't want to print you > > have to retract much further or it oozes out as the Bordon tube > > relaxes. Then when it's time to extrude the first bit of filament > > flexes the tube again before it starts applying pressure into the > > nozzle. > > > > The other major problem with mine, which others have fixed and I > > still need to, is as the extruder moves up it vibrates the sides. > > Others have built extensive bracing holding the top solid in 3 > > dimensions so it cannot move. > > > > One friend changed to a higher end unit and hasn't looked back. > > I'll ask him what he bought. > > > > I expect garbage from my 3D printer so if I get something that looks > > half decently nice I'm pleasantly surprised. So it's all about > > expectations and mine are much lower than most. > > > > For example I printed this from 4 pieces and glued it together so I > > could see what the final version would look like and if I had fit > > issues. LinuxCNC has no trouble driving the STMBL to turn this. > > http://www.autoartisans.com/mill/HarmonicDrive/FullSize-6.jpg > > > > Then I went back to the CAD system and expanded for shrinkage and > > added fillets etc to be able to make a pattern. Still in 4 pieces. > > > > http://www.autoartisans.com/mill/HarmonicDrive/PrintedPattern.jpg > > > > A bit of body filler > > http://www.autoartisans.com/mill/HarmonicDrive/PatternPrep-1.jpg > > primer > > http://www.autoartisans.com/mill/HarmonicDrive/PatternPrep-2.jpg > > and paint > > http://www.autoartisans.com/mill/HarmonicDrive/PatternPrep-3.jpg > > and then a test ramming into a crucible while I continued with > > building a crucible capable of holding 15 lbs of aluminium. > > http://www.autoartisans.com/mill/HarmonicDrive/Pulled-1.jpg > > > > And then there were these. > > http://www.autoartisans.com/images/HeartsInGym2.jpg > > > > I printed 300 clips that held the GE-35 RGB Christmas lights in the > > heart frames. The hearts showed a gold colour with random twinkles > > in white (like silver sparkles). On the far left is a small box > > with 50 LEDs in the same pattern and an ESTOP button modified to not > > have the latch. Press the button and all 6 hearts changed to a > > pulsating RED in the rhythm of a heart beat. bmp BMP, bmp BMP... > > for about 40 seconds. Time for the bride and groom to find each > > other and kiss. Like tinkling glasses during dinner. > > > > Then back to gold with white sparkles. The hearts themselves were > > 1/8" mahogany stiffened with frames for hanging and covered in gold > > mylar. I now really dislike spray glue... > > > > 3D printing is great where you can't do something any other way. > > What I have found though is it's like a drug. The end result people > > become like someone who only owns a hammer and everything looks like > > a nail. > > > > John Dammeyer > > There is that too. I went back to check on it, and from the evidence. > the heat of the motor wasn't excessive. But the motor shaft has spun > itself loose in the bearing carrier. So the motor was still spinning > buteverything was motionless. Now I take it apart to verify since this > model has no portholes to see into it. > > Sigh...
No, the flexgear broke. Replaced it with a spare from the first ever build, now back to running it again. This gear was made before the hot end freezeups started, so has plenty of plastic in it, but it was made face down so had 2 oz of supports to break out. We'll see how long this one lasts. After the first 2, I did them face up so the support was on the bottom. Much easier to cut away. And it ran about 5 minutes, broke the cup of the flexgear off at the disk junction. Only 1.2mm thick there, concentrating the wall flex into that relatively sharp corner. Can I fix that in cura? How? Looking at that edge with a strong lens, I see 3 layers of wall, with quite a bit of air too. So I was still having plastic delivery problems even after calibrating it according to Andy, where scale is set to deliver 100mm of pla for a 100mm move command. But when I can find the tune menu, I found another place to set that and it was factory set to 82. So its still starved for plastic if its following that setting. Bruce mentioned TPU with an 85 or better shore as being more flexible but I've not found that for sale anyplace. URL anybody? Thanks all. 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