On Wednesday 22 July 2020 03:39:02 Gregg Eshelman via Emc-users wrote: > Design a sacrificial piece that fits closely but not too closely to > the inside area that needs supported. There are plenty of models to > download that have support structures as part of the design, with just > the right gap between their top surface and the underside of what > they're supporting so they'll easily come off and leave a good > surface.
The only BOM is the .step file. freecad renders it but shows only the final assembly. A freecad newbie, I need to figure out how to separate the parts, or x-ray vision. The .stl files fill all available space with supports with only a 15 thou clearance to the real part, not conducive to getting a prybar under it it at all. > Make it solid with several internal voids that have a pointed top at > the angle you have set to not need supports. The walls can be pretty > thin, I'd try for a spoked design sort of like a spigot handle. Then > you'll have the upper surface solid and ribs on the bottom to grab > with pliers. > > To figure out the space you need to not permanently adhere the > sacrificial support to the model, make a simple model of an inverted U > with a straight horizontal bar and a block that almost but not quite > fills the center. No need to make it huge. Adjust the height of the > support block until you get the results you want. A nifty thing that > can be done with 3D printing is a light press/snap fit. On this thing > the three towers fit firmly into recesses in the base while the thin > gears used for adjustment thumbwheels are a perfect sliding fit so a > few drops of super glue gel hold them. > https://www.thingiverse.com/thing:1752729 I tried a few times to make > a proper thread for the two adjusters but couldn't make it work so I > went with a loose fit with two coarse spiral grooves and a pair of > pins on the rotating part. Inspiration was early rifled cannon that > used lugged projectiles. > > I've also used a fit that uses the layer lines to snap together but > not so tight they're inseparable. Works well for jigs that need to > hold together for things like holding pieces into 3D printed knobs > filled with resin while the resin cures. > > On Tuesday, July 21, 2020, 11:18:06 PM MDT, Gene Heskett > <[email protected]> wrote: Greetings all; > > And had a hell of a time removing the internal supports, which > probably out-weigh the gear, digging it out about 1/4" at a time until > I was able to actually get a grip on the edge, at which time the last > half of it popped right out in one piece, clean as a whistle. But it > seems like there ought to be a way to pop it all out in one piece as > opposed to a couple hours work with a miniature back hoe in the form > of the e. tech's ever present 5" flush cutters. Looks good, meshes > well and walks around the ring gear like it should. 2nd one building, > be done around a late dinner time tonight as its an 18+ hour job. > Don't know if theres enough PLA on that spool for 3 of them. With all > the support structure it uses a lot of PLA. Cura estimates it but I've > forgotten now. > > But is there a support removal tool that isn't radioactive? > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
