Quotelkcl Quotechrigel ...anyway, that'll mean the G3 STL files I have aren't good either as they don't even include the Direct Drive Adapter models as far as I have seen. Since it looks rather like a very "short" NEMA motor with a driveshaft mount at its top, I guess it shouldn't be too hard to model there's a NEMA-17 already in the model *grumble* i seem to have added the STL file *grumblby chrigel - Extruded Aluminum Frames
Thanks for the updates. On the topic of missing STLs: Quotelkcl make sure that there's at least... _some_ file there, even if it's blank, and if it's not the same just put in "self.visible(False)" to make it disappear temporarily ok? Whatever you did in the last commits, after the update and "make download", everything seems to be working - I haven't had the need for empty (or different) STL fiby chrigel - Extruded Aluminum Frames
Awesome lkcl, thanks for getting the git link working. Cloning it was a breeze. Then the dreaded "make download" failed again of course, on the URL http://mutley3d.com/DLoads/FlexSTL.rar as mutley3d.com doesn't exist any more and there are no downloads at the new flex3drive.com page. I asked Jason from Flex3Drive for the G2 extruder STL files but he emailed me G3 STLs instead (maybe because G2by chrigel - Extruded Aluminum Frames
Quoteo_lampe Hmmm, I still don't get the argument for the Benson belt gear reduction? You want to use it to reduce belt tension, but at the same time the belt is longer. Where do you see an advantage? Belt stretch would be the same, right? I was wondering that myself lately. So I'll try to formulate the problem in mathematical terms, assuming the belt obeys Hooke's law for springs. Also assumingby chrigel - Extruded Aluminum Frames
Ah, I also sent you a private message about the links on the wiki... thought this is not really "on topic" here.by chrigel - Extruded Aluminum Frames
Quotelkcl i'm already using both those layouts. to interlace the belts the planes have to be inverted relative to each other in a very specific way. ok so here's a top photo: you can see that the belts are mostly not intersecting the gantry rails, with the exception being at the ends. i did a video as well (at the end) to show you, it's *very* specific. Wow, you're quick... thanks a lot forby chrigel - Extruded Aluminum Frames
About the 1:1 gear option: Quotelkcl [...] the main thing is, i wanted people to be able to do high-accuracy with this design as well, meaning the possibility of running at much slower speeds, using e.g. 0.15mm E3D experimental nozzles, where you actually start to get artefacts from micro-stepping showing up in the print if you have a 1:1 ratio. Wow, that's fantastic. You know, I am more and morby chrigel - Extruded Aluminum Frames
Instead of removing the pulley system, couldn't you choose a 1:1 gearing (if available)? That way we'd keep the advantage of the belt tension being halved.by chrigel - Extruded Aluminum Frames
Quotelkcl Quotechrigel When I read about the intention to use a 40:1 gear from the NEMA17 to the rod that moves the gantry belts, which isn't the case. the 40:1 wormdrive is in the flex3drive - in the extruder only. So I misunderstood the highlighted part of that page? Quotehttp://reprap.org/wiki/Riki200 Concept 3 The concept here is to use twin belts per axis with 340mm 5mm OD rods connectinby chrigel - Extruded Aluminum Frames
Ok, started to think a bit about Benson's "Ultimaker-style" belt concept... augmented with some info I gathered from the Riki200 page. Unfortunately I had to make some assumptions as the BOM link doesn't seem to be working (same with the other links to hands.com). When I read about the intention to use a 40:1 gear from the NEMA17 to the rod that moves the gantry belts, I was wondering whetherby chrigel - Extruded Aluminum Frames
Quotelkcl it's much, much worse than that: the change in angle of the belt coming off the X-gantry and leading to the motor results in non-linear printing. even just 1mm of misalignment can result in a huge and noticeable amount of distortion. I agree. If that was the case, it would be really horrible. Quoteo_lampe My gut feeling tells me, that the red wire not running parallel to the blue belby chrigel - Extruded Aluminum Frames
Quotelkcl yep that's it! that's exactly it. regarding the blue belt crossing the rods, you can instead make the red belt attach to the far left of the yellow (left) block, and also make it the *bottom* belt. then the blue belt can run through a channel in and *over* the left yellow block. Great idea. Quotelkcl now the only thing is, as prot0typ1cal mentioned (sorry i haven't caught up and aby chrigel - Extruded Aluminum Frames
Quotelkcl topologically equivalent. red belt goes round in the opposite direction to original sketch, no change in functionality. assuming red belt is offset by 12mm from blue. Nice, I like that left and right edges now only use a single colour so we can cross the respective other easily. Quotelkcl however it makes a 3D red-blue barrier only on one side (at the bottom). Hm, I have to disby chrigel - Extruded Aluminum Frames
Quotelkcl the problem is: the 2x pulley and the 4x pulley are on opposite sides (separated by 320mm). what happens, therefore, is that when the motor turns you get *twice* the force pulling on one side than on the other. what that does is create "lag" on the x/y-ends, and the whole assembly shears sideways. one x/y-end is pulled harder, that causes shear, and it's only when the force of the roby chrigel - Extruded Aluminum Frames