First off the motor is limited to 3 Nm or whatever. It can not crush plastic. The worst case a pulley will see is a stalled out drive motor and after the motor stops it can not pull harder. So maybe "10 pounds max" is all the part can ever see.
That said what you want to adjust is the "wall thickness". With a 0.4 mm nozzle you can make the walls as thick as you like in multiples of 0.4mm. Cura's default is 0.8mm but I find going to 1.6mm is good and makes very strong parts. 2.0 mm is over kill. Then behind the wall is infill and this can be 10% or even 100% solid. More is stronger but very little is gained after 40% infill density. You can double the print time by settig to 80% not little is gained. The hub is the weak link, not the infill. One thing to turn on is "connect infill lines" as this structurally connects infill to the walls. Also "print alternate extra wall" will do the same. With this you can use 1.2mm walls and be stronger and lighter. Do it both ways and look at Preview. 1.2mm wall with those to settings is best. as it gives you a better designed 1.6mm wall. Same applies to "skin" Skin is just a wall that is parallel to the build plate. going to 1.0mm skin is enough for these small parts. 1.2mm adds a lot of print time. You can specify 5mm walls but the print time goes up and the motor can't crush a 1.6mm wall. I print rings that slip over 24mm steel hubs and my rings are about 6mm thick so a 1.6mm inside wall and 1.6mm inside wall only leave a few mm for infill on a 40T pulley and my 30T pulleys come out solid. But if you try one of these with a 9mm "D" hole on a motor and try and test it, the "D" fails and the set screws fail and the 9mm hols become 9,5mm bt the teeth are like-new. Even with 1.2mm walls the belts skip teeth and strip hub-hols before the teeth fail. As said by everyone ALWAYS look layer by layer at Cura preview. You can see every line the printer will make. Yes do check the depth of the wall behind the teeth but the stress at the hub is about 5X greater. Look in preview that overhangs are supported On Fri, Jun 5, 2020 at 5:34 AM Gene Heskett <ghesk...@shentel.net> wrote: > > After doing that one, i took the right post slider loose and loosened its > fit on the vertical, as I noted there were Z movements that weren't > making to the other end of the bar. > > And raised the tension in the x belt which turned out to be slack enough > it was just laying on the right end idler pulley. > > But before I try another 10 hour print, I'd like to see an improved much > better filled tooth profile, my guess is that its 10% or less, no high > strength fill behind what might be called teeth. I'd like to see a 100% > fill for at least 4mm behind the teeth, but cura isn't doing any of > that. Those teeth are 100% crushable all the way to the bore > reinforcement. > > And I can't make the 2 part either, this pulley code won't render if the > shaft is >9.9mm. Question already posted on that. > > Thanks folks. > > 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
