Discussion in '3-D Printing and Related topics' started by JohnCoker, Feb 24, 2019.
Early forays into 3D printing for HPR parts:
Great video. Break up a large print is one thing I need to get good at.
John great video, what CAD program do use? BTW I just received the new Nozzle X for my MK3. I typically print at .2 and sometimes .15, but I have never really observed that .15 was 25% better in resolution. That is until now. I ordered both the .4 and .35 Nozzle X and I installed the .35. With that I just printed something at .15 and man is it clean. The resolution difference now is night and day. I would say out of all the modifications I have done this is the most obvious improvement.
I will have to figure out how to gussets and rabbits in tinkered.
I would like to see the finished booster nose cones. Those are the kind of parts that seem ideal for a 3D printer. I know how to cut things apart in OpenSCAD (well, sorta) but I have no idea how to in Solid Edge. Will be interesting to see if I can figure it out.
Thanks for the tips,
I've been using Rhino, but I will eventually switch to Fusion 360 (which seems to be more popular).
I am still using the 0.4mm nozzle that came with it. For detail parts, a finer resolution would definitely be nice, but for these largish parts, I'm fine with the coarseness of the default nozzle.
I will eventually try smaller nozzles to see how that works, but these things take so long to print that I'll wait until it really matters.
You don't need any special features. For a rabbet, draw a tube that overlaps the end of the part and the "subtract" it from the part. For a gusset, draw another part that forms the gusset (disks or triangular solids). You don't even need to join them; just export them in the same STL file and the slicer will treat it all as the same part.
Shell Gussets by JohnCoker posted Feb 25, 2019 at 10:47 PM
So do I! I'm still refining the parts (I eventually need four). Right now, I'm trying printing the mid section as a single piece since only the tip really needs to be split to accommodate the aluminum bracket.
I'm not sure if it helps, but this is how I've done in Rhino:
draw whole part in however many pieces you need
draw a plane through the center
select the part pieces
use Boolean Split, splitting with the plane
select each piece of the part and Cap Planar Holes
Nice work John I printed a nose cone for a 5.5” inch Nike smoke over a year ago that I need to get back to and finish. It was printed in 6 sections.
Being a long-time hacker and a 3-D printing noob, I had to give it a try. My lathe skills are at best moderate. I always dreamed of printing the plugs for my larger nose cone molds. So here it is. Yet another nose cone designer. Rename the attached .txt file as a .scad file and open it in OpenSCAD with the customizer enabled. You'll have a little UI that lets you design and tweak any of the 10 basic styles described on the wikipedia "Nose Cone Design" page. The program also lets you specify the size of your maximum print volume. If your nose cone is too big, it'll slice and dice it to fit. The program adds alignment tabs and gussets as necessary when large cones are chopped. There are also a couple parameters to control the looseness of the fit for the alignment tabs. I've only printed a couple cones so far, but it seems like it's working, well.
Wow, very cool. I downloaded it and tried it out. It works well in inches. When I tried the metric option though the slider limits prevented me from entering any practical numbers. Looking over the code I see the slider values are comments after the variable definition. Seems like you'd almost need two files, one with the values for metric and the other for imperial.
Otherwise, a very useful file, already learned quite a bit by looking over the code. Thanks for posting.
Thanks! I thought I had picked range values that covered both the mm and inches options. Which ones were most offensive? You're probably right that there should just be two files. What I really wanted was to be able to compute the range endpoints based on the units choice.
Doh! I see now. I must have had 2.54 mm/inch in my head when I entered some of those ranges.
... and here's one that doesn't divide by zero when using mm's.
Excellent work! (I added a link to my page.)
I can't figure out how to export the individual pieces as STL files for slicing. When I've created objects in OpenSCAD before I can render individual pieces, but I can't figure out how to do that here. I'm using Cura for slicing and I can't see a way in that to break the STL into pieces.
Is there an intermediate step I need to use in this case?
Large format printers help as well for big one piece projects.
I don't know about Cura. I export a single STL from OpenSCAD and use Slic3r PE (Prusa Edition) for slicing. It has an Object/Split menu option that finds each of the separate pieces and drops them on the X-Y plane. From there you can delete, replicate, and arrange as you like.
Thanks you gave me the phrase to search for and I found out that Cura no longer does that, but that there are other applications that do such as Meshmixer.
Here's an update to NoseConeDesigner.scad that fixes a bug that occasionally prevents rendering of the nose cone when the shoulder base cap is used.
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