On Thursday 16 July 2020 23:17:00 Thaddeus Waldner wrote: > It is unlikely to be nylon simply because it would be a poor choice > for a “first print.” > > Nylon is highly hygroscopic and needs to be be dried before printing. > In some environments it will absorb enough moisture in a day to make > it unprintable. It also has a thermal expansion coefficient that is > similar to ABS, which makes it more difficult to keep from lifting and > warping. And it needs to be printed hotter than ABS. > > > It might be PETG? > > > It came with a small hank of semi-white, might be nylon but I've no > > clue what it actually is. Sealed in a clear poly bag, along with an > > unlabeled nozzle and entry connection for the feed tube from the > > ejector motor. Looks to be the same size as the black stuff but has > > that faintly translucent color of nylon. Might be enough to make > > two of this sprocket. Not enough to get familiar with it and make > > good stuff. > > As for printing a gt2 2mm sprocket, I can’t do it well with my > dinosaur of a printer. And not for lack of trying, as I have a whole > bucket full of nema 17 and nema 23 stepper motors I collected from > junked office printers. Almost every one of them has a press-fit gt2 > 2mm sprocket. Perhaps if I could slow it down for fine details it > might work better but as such, all I get is correctly spaced bumps > instead of tooth profiles. I’ve had my friend print me a few gears > with one of those Prussia-style printers with much better results, so > it is doable.
I think if this doesn't work with a 2mm smaller bore, which I'll try tomorrow, I'll probaby do something else entirely. XL stuff works well, and with the remaining hub being around 12mm, I could wrap a coarser toothed pulley around them once the stopper bracket was gone, and make that work, but coarser teeth also make for more periodic error, and this is quite important for astro-photo work. I'll figure out something or miss roll call eventually. Thanks Thaddeus, stay safe and well now. > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
