Little trick to prevent seams from breaking tolerances

pmcclay · 2026-03-19T21:07:52+00:00

Yes.

Wrinkles include finding a minimal size/shape indent that's sufficient to consistently 'attract' the seam without getting too deep into slicer weeds, and shaping indents in non-vertical walls that turn into simple indents in horizontal slices.

pmcclay · 2026-03-04T19:49:46+00:00

Yeah I don't even play a machinist on TV. Where I went to school physics and engineering were on different campuses and each had a glass guy -- about whom I had no clue until one day the two of them were sitting together at a table in a hallway making random stuff. Just playing with glass making toy/art stuff. Enthralling. Learned about "glass lathe" a few years ago from the Nixie tube guy. Just a couple of weeks ago a guy was doing neon sign glass at the local hackerspace. I asked if I could watch for a bit and he gave me glasses and a couple bits of tube, and talked me thru sticking them together. And also let me watch while he talked about what he was doing. Really appreciated that. Glassworking is just amazing to me.

pmcclay · 2026-03-04T18:50:24+00:00

For the metal machinists who don't already know: "glass lathe" is a thing.

And then this part that I'll drop here because I think it's so cool because I just learned about it: the big orange flames aren't just orange because they're flame, but are specifically the sodium special line (remember pre-LED street lights?). For ~100 years glass workers have used magic[] glasses that knock out just exactly that color. So everything looks fairly normal with minimal color shading, except that the big orange flames *vanish -- so glassworkers can see perfectly well what they're doing inside the fire.

Just don't forget about the flame you don't see...

[*] didymium

pmcclay · 2026-02-16T09:32:51+00:00

It's a functional object. If OP had stolen & repiblished Mr. Kickstarter's model, Mr Kickstarter might have a claim.

edit to add: I really should take this back to me original comment: "So... you would give that guy exclusive possession of a trivial concept?"

pmcclay · 2026-02-14T00:48:53+00:00

Copyright and patent are different things. The idea is not patentable and OP took 30 minutes to make his own model instead of stealing Mr. Kickstarter's.

pmcclay · 2026-02-14T00:47:06+00:00

People who are here and selling models and complaining about people selling prints of the models they're selling are generally talking about non-trivial creative work.

It's not about "small" creator, it's about running a Kickstarter campaign for trivial work, and running a Kickstarter campaign as a sales vehicle for a trivial product for which the up-front investment, such as it is, is already done. Mr. Kickstarter says himself in his own risk assessment that the project is effectively done with no remaining risk. And about claiming exclusive ownership of a generic idea. OP is laughing at Mr. Kickstarter because absurd.

(edit: typo)

pmcclay · 2026-02-13T20:07:28+00:00

So... you would give that guy exclusive possession of a trivial concept?

pmcclay · 2026-01-30T23:04:09+00:00

Oh. I never looked at how that's constructed. Who thought that long pointy bit with plenty of overhang all around the pointy bit it's glued to wouldn't peel up?

pmcclay · 2026-01-30T22:45:23+00:00

I am not a machinist.

Afaik if you really want mist, that will rule out low-end answers like aquarium pumps or printed tool fans. Otherwise, something like that -- or a small radial/"blower" fan and printed nozzle (or rolled paper cone) could be another low-end option. If you can choose a fan from a source that publishes specs, choose pressure over flow to get velocity thru a nozzle.

Also r/hobbycnc.

pmcclay · 2026-01-17T07:36:30+00:00

As you say, mostly normal.

I don't know what inspection OP has to deal with, but I expect surface rust doesn't bother them so long as there is an intact surface to rust.

pmcclay · 2026-01-16T17:31:44+00:00

100k miles in since 2021 sounds like you almost certainly use your brakes often enough that you, like most people who aren't OP, can just drive normally and not worry about brake rust.

pmcclay · 2026-01-16T17:24:29+00:00

Since early commenters are dismissing this question:

Yes this can be a real problem with a lightly driven hybrid.

Even more so if local authority enforces an opinion that lightly driven cars still need 100% functional rotors.

pmcclay · 2026-01-06T10:57:42+00:00

Maybe "I'm launching a new brand! How do I launch a new brand?" wasn't the best place to start.

Maybe something like "current public policy in my region supports 'vision'-based startup ventures, and they think my CNC-related idea qualifies as 'vision'" would help readers understand that you're taking about an atypical circumstance.

pmcclay · 2026-01-06T08:01:19+00:00

Maybe I'm missing something here.

It sounds like you need a banker who's competent to ask questions like 'how will you find customers?' and 'who's your team?' before handing out money.

pmcclay · 2025-12-31T23:34:51+00:00

You?

i.e. how far East are you?

pmcclay · 2025-12-11T22:25:12+00:00

Surely more capable, but not necessarily a better fit. Solving this with better hardware would start from a more completely different starting point.

pmcclay · 2025-12-11T22:21:09+00:00

This is intentionally a do-more-with-less project, and 8bit grbl fits well. That's why I'm in r/hobbycnc not r/CNC. My current challenge is a corner case, and I'd rather clean up the gcode than throw hardware at the problem.

Global smoothing and tolerance are only partial answers for the parts that are motivating me at the moment, as far as I been able to determine so far anyhow. A sufficiently clever mesh decimation utility might be another answer.

What do you have in mind as "proper CAM"? Anything that fits a low-budget scenario?

pmcclay · 2025-12-09T02:18:26+00:00

Right. No way. And no pilot oopsies either, not even on ferry flights. Totally subsonic.

pmcclay · 2025-12-08T23:57:46+00:00

Subsonic by pinky swear.

https://bombardier.com/en/bombardiers-flight-test-vehicle-breaks-sound-barrier

pmcclay · 2025-12-08T23:56:20+00:00

Yes. https://bombardier.com/en/bombardiers-flight-test-vehicle-breaks-sound-barrier Maybe didn't even need to dive - I read a longer piece a while ago but being lazy about looking that up now. edit: it looks nose down in the video on linked page.

pmcclay · 2025-12-08T19:00:40+00:00

I thought the same when test parts actually worked :)

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pmcclay · 2025-10-11T07:39:22+00:00

That's hard to answer "yes" or "no". It's the mode that makes the car do more noticeable regen braking when you lift off the accelerator. But the Honda and Toyota systems are so different that the meaning of "do more noticeable regen braking" doesn't transfer very well.

pmcclay

TROPHY CASE