Greg's Wade reloaded - Guidler, Tilt Screws, Fishbone Gears, Parametric Filament
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Instructions
Version 2 - Some more improvements. I designed a clasp that rides along the 4mm bolts, and allows a 3mm screw to drop into a hole in the guidler, no more slipping off. I also added a throat to the entry of the filament path, below the idler-bolt junction. Hopefully we can feed filament into the guidler with it closed and it won't jam. I also rounded the edge that the m3 screw has to pass over to make it easier to use. The stls have been run through NetFabb's cleanup service. The springs that I use are seat springs for Delta/Peerless faucets.
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I tried to compile and save the scad file attached.
There are two problems with it...
#1 .. all he "include" files are missing .. well I found them on jonas post .. so that's ok.
#2 If you try to export the design as STL it OpenScad says not a 2D manifold .. modify your desing ..
Clearly the Scad file uploaded is not the file that was used to post STL ..
Can you fix this issue?
There are two other "issues" with this design .. oh well 3 .. most of them I think are inhe
rited from Joans deisng.
1. Also the suport of the idler Hinge is made too small .. there is no need to make it that small .. it should attach at a small point .. it should have a wider base at go up conically to attach.
Small Geometries are a problem in a large print and this one just rolls over
(ABS on glass with 3M tape) and doesn't stick well.
2. The top of the main extruder has bascially ZERO thickness for the screw holes . the holes print but the top is almost open .. that thickness should be increased so that screw/bolt doesn't fly out the hole ..
3. The idler holder has "rounded"
top .. there is no reason for it .. it's just making the top thin and weak .. one should just make a clean square part.
I wanted to do these changes but can't even get the original files to produce the STL .. and I am too new at this to figure out where is the problem..
Please advise if you will
...
Thanks
I suppose I might have changed something in the dependent scad's and forgotten. I just uploaded a zip of all the SCAD files required to build the extruder. I copied them to a new folder and compiled the design and generated a stl. Seems to work. There are libraries that come with OpenSCAD that may be required as well.
I am using OpenSCAD 2011.12.30 and Python27. Obviously it generates STL files for me. Which SCAD file? You should be using V2, but both should work. I have had another person have problems with the SCAD file, thinking it was corrupted. I have downloaded it from thingiverse several times, the downloaded file is identical. Email me and I will send you the file direct. In fact please email me your downloaded copy so I can compare them.
I agree with you about point 2, but haven't bothered to fix it. With this design I am able to change filament without opening the guidler. I've never had a problem with the support coming loose, but I agree that it could be better.
where does the plastic washer go? Do we just need the two gears from the original version? Thanks for the model!
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Very nice.
I'm wanting to change the base to fit the quick-fit X carriage by RichRap, but before I start I'm sanity-checking by exporting STL as-is to Slic3r (0.9.7) and it's giving me that (not manifold) thing...
Is there something in the OpenSCAD code I can alter to stop that?
Sorry about the "not manifold" issue. There seems to be a difference about the slicing engines and how fussy and or accurate they are about this issue. Skeinforge processes the stls and prints them, SLIC3r doesn't. I have no idea how to fix it in the source code. When slic3r complains about an STL I use NetFABB cloud service (or the stand alone netfabb program) to repair them. At the time of posting I wasn't using slic3r so had no idea that it was unhappy.
As for the layer setting I believe what the SCAD code trys to do is change the vertical dimensions so that they are quantized in layers. I would assume that the slicer code does much the same thing, so I am unconvinced that doing it in the source code is very important. One example where it may be important is in the membranes that are put across vertical holes that have step to smaller diameters. The step to smaller causes a bad overhang that doesn't print well. By designing in a 1-layer membrane across the step the overhang becomes a bridge which prints well. By knowing the print layer the membrane can be made as thin as possible which makes for easier trimming.