On Saturday 13 February 2021 05:50:26 Gregg Eshelman via Emc-users wrote: > Make a fit test one about 1/4" thick, and if the software can manage > it, only print 1/3 to 1/2 a circle for a faster printed fit test. > > > On Saturday, February 13, 2021, 3:06:12 AM MST, Gene Heskett > <[email protected]> wrote: Greeting all; > > Messing around with the parametric pulley designer, I have made a > larger 86 tooth pulley for the big pulley on the A axis supplied with > the 6040 mill. I'll also change the belt pitch as its presently a huge > XL. > > But the chosen belt, a GT2_3mm, is not a good fit, throwing a just > detectable slack in the center of the wrap, inicating the pulley is > about half a red one too small. > > Is this a good excuse to add a couple counts to the xy scales in the > printer, or to play with the variable > > additional_tooth_width = 0.2; //mm > I have a full sized one at = 0.3, at 93% so I'll know in another hour. I probably should recal the scales. Now if I could find a way to really get the extruder tuned, that would help. I set it last fall by Andys instructs to get a 100mm feed for 100mm of drive, but thats way way way way too much. So I'm reducing it 5% or so, 2 or 3 times since, but its still running well at 61% flow in the tune settings. Any more and its stripping in the driver wheels and spitting out too much, leaving gobs and gobs of extra extrusion messes. This is with the micro-swiss driver, and junking their hot end cuz it backflows and freezes up, so the stock hot end was reinstalled after moding it to run the teflon clear to the nozzle with plenty of compression pressure on the tubing, and the top end made longer and better shaped so it was litterally ground to shape and fit by the extruder rollers. Fits so well I can actually change filament just by warming it up to extract the old.
The factory extruder settings made a waving cat so thin I could read the newspaper thru it. Perhaps 15% of that which was needed, and the adustment rate is so slow it takes half an hours cranking on the knob to change it 10%. So Andy's instructions took most of a day to ectually execute. So now with the hot end mods it doesn't get any real heat until it is actually in the nozzle. But it doesn't flow back into the heat sink and freeze up either, making you take it all apart and drill out the cold plastic. The nozzles really need to be redesigned to allow the teflon tube to actually enter the rear face of the nozzle with a tight, squeeze it a little fit to stop the leakage at the rear face of the nozzle better. This setup works much better but does restrict the speed of melting, and really, for PETG, needs another 10F beyond the 250F limit currently imposed by both the heater wattage and the marlin software running the printer. But I've not found a path to file a bug report despite their claim its 100% open src. Sigh. 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
