"TPU" has a wide range of properties depending on the brand. This is good because you can match it to what you need from very soft to a kind of hard rubber. It is harder to print and not the best for Bowden tube printers. It is like trying to push a rubber band dow the tube. My printer has the filament feed stepper motor mounted on the hot end. This adds a huge amount a mass to the head but the delay from pushing filament to a drop coming out the nozel is less. It is a design trade off. But if you print slow enough it does not matter.
I bought the TPU for finger pads for a robot gripper hand but found other uses for it. If you have it you will find some use for it. If nothing else a cell phone case. On Mon, Aug 17, 2020 at 10:32 AM Gene Heskett <ghesk...@shentel.net> wrote: > On Monday 17 August 2020 05:21:28 Bruce Layne wrote: > > > On 8/17/20 3:52 AM, Gene Heskett wrote: > > > This one is printing at the same scale as the output shaft, which I > > > just remade after finding they were to big to enter the main bearing > > > even with help from the assembly screws. So this will have a smaller > > > bore, which means I'll have to make a smaller internal spline, and > > > that may demand a smaller bearing carrier, as I need it to push the > > > splines fully engaged, but only enough clearance from pull-in that > > > at the midpoint between the rollers, the tips of the splines clear > > > each other, this condition corresponds to the minimum flex it needs > > > to work=longest life. > > > > Maybe you should have started your 3D printing with a baby Yoda like > > everyone else. :-) > > Actually, the waving cat was on the sd card. Weighs less than a gram, I > can see thru it from any angle, OOTB it was that starved for plastic. > The flexgears I'm breaking quickly were somewhat similar in that there > are pinholes in them that let light sparkle thru. > > This ones not done yet, it just started on the ramps to the splines and > when I saw that I slowed it back down to 90% as I had it up to 170% in > the middle of a now thicker and nuch denser 6 wall build. cura settings > are for 6 line walls, 15 ipm and 30 ipm. Plate cooldown after 1st layer, > 61 to 55, and 215 for 1st layer then 200. Structure under it is called > zig-zag, and starts out pretty sparse, but leans into the gaps > eventually looking pretty solid. > > This smaller scaled flexgear changes everything around it, so I'll stetch > this one into an internal spline to see if it needs tweaked for size, > making scale adjustments as needed and then diddle the scales for the > proper size of bearing carrier, which should push it out of round, > stretching the sides enough to let the splines hop over to the next one. > First pass at all this only half engaged the splines, so it had backlash > up the yang. And flexed the flexgear bad enough the splines had 2mm of > clearance at the hop-over point. A smaller internal spline will reduce > that clearance and the extra flexing that goes with it. > > The bearing carriers I have made 3 of, measure 74.84mm acroos the > bearings, but when figuring scaling, you need to subtract the bearing > diameter from both ratios if you want a new SWAG guess for their scale. > So they will need to shrink by the thicker walls differences. For a > first guess... > > When the tpu gets here, is its shrinkage different? But I'll likely wait > until the micro-swiss hot end kit gets here and installed. Running w/o > the sock on the hot block works that heater R about 3x as much. Looking > at it, if I could make a baffle that goes into the hot/cold gap, keeping > the fans breeze off the hot block, that would be nearly as good as the > missing sock, and a heck of a lot longer lasting. A BBLB design for > sure. > > Its possible the micro-swiss kit will be here tomorrow too. > > > >> 1500 mm/minute for all motion > > > > > > Thats 3x the top speed setting in merlin. > > > > You may be seeing mm/second units rather than the mm/minute that I > > specified. 1500mm/min = 25mm/sec, fairly slow for a 3D printer. > > I think you are right. As usual. :) > > Thanks Bruce. > > 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 > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
