I just printed a set of 3mm pitch GT3 timing pulleys with my 0.4 mm nozzle. They came out just fine.
The final profile of the pulley tooth is not determined by the nozzle diameter it is limited by the step size on the printer. My pulley fit the belt well enough that tooth shape is not the limiting factor. On my case it is runout, not tooth shape that will cause the greatest error. Think of an end mill cutter. I can make sharp corners with a 12mm diameter end mill. What I can't do is make less then a 6mm inside radius. Same with the nozzle but backwards. A 0.4mm roud nozzle can make at best a 0.2 radiu corner while the 0.2 nozzle can print a 0.1mm radius. But the printer steps are that size and introduce a larger error than the nozzle. In any case what you really care about is error in motion transfer between the pulleys. Runout matters but a tiny radius error on an outside corner does not change how the belt sits in the pulley. There is a big disadvantage to 0.2 nozzles (1) they clog up and need cleaning and (2) printing is about a lot slower. Your first step before printing pulleys is to print a cube. Use CAD software so you know the exact dimension you specified, run it trough the slicer, print and measure all sides and angles. Get those measurements good enough. When designing with plastic, you have to make stuff bigger. Use the largest pulleys that will physically fit and this keeps the percent error down. I any case my A6 primer is the same as your Ender except mine uses ground steel rods for track and yours uses extrusions, But everything else is the same all down to the Merlin firmware. My 3mm pitch by 9mm wide GT3 profile pulleys came out pretty good. I had to make the flanges wider as the aluminum pulley design has tapered flanges that came to a point. I made them thicker and blunter and used a 20mm center bore. Odd that I could print the tooth profile just fine but not the flanges. On Tue, Jun 2, 2020 at 10:26 AM Gene Heskett <ghesk...@shentel.net> wrote: > On Tuesday 02 June 2020 12:50:54 Karl Jacobs wrote: > > > Gene, just make it executable and run the appImage. I use Cura to > > slice for a Delta-printer and use LinuxCNC (actually, Machinekit on a > > Beaglebone) to drive the hardware. Marlin on Arduino hardware works > > nicely too, of course. Good luck with 3D-printing, just needs the > > usual learning curve. > > Karl > > > Which for my ancient 85 yo wet ram seems pretty steep, but I think I have > the top of this hill in sight. That 3d cat is printing now... :-) Ought > to be done by dinner time. > > I think I need to find some .2 nozzles before doing any XL timing pulleys > though. Thats about next. Then I suppose I'll appreciate the speed its > doing now. > > Thanks Karl. > > 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
