| Products > 3D printing |
| Resize a STL File For Me |
| << < (47/48) > >> |
| MarkF:
--- Quote from: bostonman on December 31, 2024, 12:18:41 am ---In that video, he created half the bracket (?) and then mirrored it to make it a full bracket. Does that create two "halves" (i.e. a microscopic gap) that will result in a weak bond when printed or does the software (FreeCAD in this case) know enough to make it one uniformed shape? --- End quote --- Since the bracket has symmetry around the center, he saved time by only drawing half and mirroring it. The results would be the same if he had drawn the whole bracket without the mirror. After the mirror, there won't be any microscopic gap. The bracket will be one complete solid. The strength will depend on the cross-section where the mirror occurred. The same with the two shapes in the example you created. Once you have them so they form one object, the strength comes from the cross-section where they meet. As you build your shape, it becomes a solid and the strength comes from the cross-section at any point and the characteristics of the material you print with. --- Quote ---Another question I had is piggy backing off my last one. In the attached shape (I tried to come up with a comical name since some of you enjoy my file naming), let's call it a purse since it resembles that, how do I edit the non-planer part to say curve the strap a little to avoid the edges cutting into the hand carrying it? Not curve the entire strap into a U because I think that may be simpler since it's a uniform shape, but say I wanted to curl the edges slightly and leave the rest of the strap flat without cheating by making a fillet on the faces. --- End quote --- Here you need to think outside the box a little. No one says the handle has to be a single circle. In the sketch, build the upper half as a semicircle. Then extend the ends with an arc to connect to the purse. The extensions can be of a different diameter than the semicircle to get the shape you want. If you want to go overboard, you can use splines or pipes to create a custom shape. "So, how long have you been carrying a purse?" |
| bostonman:
--- Quote ---The strength will depend on the cross-section where the mirror occurred. --- End quote --- I must have misunderstood initially. So if I create two cubes (let's say a pair of dice) and "touch" them, it will print as one solid (the same as if I created one large square/rectangle) rather than a microscope gap between the two; and it would be a strong bond since the cross sectional area is quite large (assuming a standard size pair of dice and the entire sides are touching). --- Quote ---"So, how long have you been carrying a purse?" --- End quote --- As soon as I send this 3D design to the printer and it prints. :) |
| bostonman:
I created two blocks and "touched" them. I created the first block, added a second to the face, created geometry lines, and used the geometry to start the side of the second block. Looking at the slicing software, it appears it's one "complete" solid part, and believe I answered my own question. I assume if I put a microscopic space between the two blocks of something so small such as 0.001", then it would technically be two separate blocks that could split apart; assuming a perfect world and perfect printer. |
| MarkF:
I can't figure out where you're going with all of this. You seem to be banging your head why you get the 'multiple solids not currently supported' in FreeCAD. Most of the time this is due to limitation in the precision of floating point numbers. Sometimes a 5 in a floating point number is 4.999999999999. You will notice in the last tutorial he pointed out where there was a small gap due to the angles involved and the solution is to overlap the pad a small amount. It doesn't hurt to embed the pad into the other solid to fill in any gaps. This shouldn't be a problem if you are able to map the sketch onto a face. In your dice example, look at how the layers are printed. If the nozzle moves in two loops for each layer, it will not be as strong as if the nozzle moved in one big rectangle. |
| bostonman:
The direction I was going was just understanding whether (using the video as an example) mirroring half the bracket results in a weak point in the middle because it would print them separately or whether it ends up being one complete solid uniform piece. To experiment, I tried a similar approach by just touching two cubes together (using geometry) and the slicing software showed that it was truly printing it as one complete uniform piece. My statement that if I added a microscopic gap by placing the second cube a fraction of an inch away, then technically it would be printed as two separate pieces. This is all I was stating. I wasn't doubting the feedback/advice from anyone, and sometimes my messages are rhetorical or stating that I took the time to "experiment" in order to get an understanding of what was discussed. |
| Navigation |
| Message Index |
| Next page |
| Previous page |