On Sunday, 20 March 2022 18:07:01 EDT John Dammeyer wrote: > Gene, > The replacement ball bearing fan isn't on the bed fan duct but cools > the top part of the hot end where the filament enters the PTFE lined > feed pipe. > Ah, PTFE lined hot end. Needs tubing replaced as even at 200c nozzle temps, the stuff eventually goes away or leaks badly. Feed it PETG at 240C, goes away in 2 days. All metal hot ends are better, titainium heat breaks even better. Better yet I suspect is the copperhead copper/ titainium combo but like the PCD nozzle, bring real money.
> Problem solved which the new blower duct, now not aimed at the hot end, > did not completely fix. should be aimed at or just below the nozzle tip. > > Wrapped hot end block in insulating paper and Krylon tape. Now nice > flat curves and no drop in temperature even with 98% bed fan speed. > > John > > > -----Original Message----- > > From: gene heskett [mailto:[email protected]] > > Sent: March-20-22 2:50 PM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Because I can't seem to finish anything... > > Nebel lathe conversion.> > > On Sunday, 20 March 2022 16:46:17 EDT John Dammeyer wrote: > > > Story of my life. Fan failed on 3D printer. Repaired feed tube > > > and > > > replaced with ball bearing fan I had from power supply > > > manufacturing > > > inventory. Almost 1 week later still not working quite the way it > > > was and the way I want. John > > > > ball bearing fans start easier, leads to over cooling the early > > layers. Change the min speed so its stopped for the 1st layer like > > it used to be at 25% power. Sleeve bearing fans often don't start at > > all till the mid 30% range. > > > > Try zero for the first layer or even as high as the third layer > > before > > the fan actually starts. I have a ball bearing fan on my BIQU BX and > > it runs plenty fast enough at 30% of max in cura for PETG which > > needs far less cooling than PLA. I don't mess with PLA at all, too > > brittle. > > > > I've also put a diamonback .4mm PCD nozzle in mine so I can use the > > carbon fiber filled PETG but haven't yet seen the need for its > > improved strength. I'm running the nozzle at 252C and the bed at 90C > > and my printed air manifold is air tight. Bed adhesion is only a > > problem getting stuff loose. Its almost too good. If the nozzle is > > slobbering, check how tight it is, then reduce the flow 2% at a time > > to stop the overflow, this PCD nozzle conducts heat into the > > filament better than brass, melting it better which can increase the > > flow. At 245C the part will not be airtight if you need that. At > > 252C the part gets noticably glossier because its more liquid and > > bonds well to the next layer down before it cools and solidify's. > > > > Take care and stay well John. And my teeny version to be used as the > > B > > axis driver on my 6040 mill, the one that costs around a tenner to > > make, seems to be pretty solid, got several hundred hours on it now > > but it probably going to get another 200 running a hard maple stick > > for a woodworkers leg vise screw. I've got to make an idler yet to > > tighten the belt as that is the only backlash it it. > > > > 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, 1940) > > If we desire respect for the law, we must first make the law > > respectable.> > > - Louis D. Brandeis > > > > _______________________________________________ > > 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, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
