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this post was submitted on 20 Oct 2023
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Bullshit.
The thermal coefficient of expansion of say... Aluminum is 23.
That means that when a 1 meter piece of Aluminum rises from 20C to 21C, just one degree Celsius, it grows by 23 microns.
Your 3D printer is not a temperature controlled precision instrument. Your tolerances are no where close to 10 microns let alone 1 micron.
There are micron-level precise instruments in the engineering world. They all come with temperature characteristics because thermal expansion is a bitch. 3D printers that literally heat up hundred degrees and cools down regularly literally can't be this precise, the heat alone wrecks your precision.
Bullshit.
You're changing the premise of the question.
Pick a temperature - design your model to be whatever you need it to be at that target temperature - just like every other engineer with 26 years of experience, such as myself.
(by the way, my UV resin printer is quite temperature stable.)
Your resin printer does not have the resolution of 1/15th the size of a damn white blood cell. Your blood is 15 microns per cell or so. Red blood cells are smaller at around 7 microns.
You, and Elon, have confused your units quite significantly. I've given you the opportunity to see your error by reminding you the difference between thou, mils, mm, and microns. But apparently you haven't gotten the hint yet.
My university created micrometer-sized balls, gears, and other such devices. They're called MEMS and are really cool. They're not made with 3d printers but instead lithography (same technology as computer chips, because they're so small its easier to make through lithography). You've confused your units and its clear based off of how you've been talking. Take a step back, and double-check the difference from thou, mil, mm, and microns.
Sigh.
Please stop being confused about the capabilities of modern SLA/DLP processes.
What is the diameter of A PHOTON? And don't forget to answer ignorantly, in a condescending i-know-more-than-my-betters tone. No, seriously - look it up. You clearly don't know.
How many blood cells wide is light? By all means - tell me what the particulate size of photocuring resin might be? Could it be....2 microns maximum even for the largest ceramic-infused resin slurry - with sub-micron particulate sizes easily available even from Amazon? Yes - far, far smaller than blood cells. This is why you can't let this shit get on your skin. It will literally traverse the blood-brain barrier. The fumes can get particles of this size into your bloodstream.
Well, what on earth can I do to get 1 micron accuracy from zero-width photons and 2-micron UV cured particles? Perhaps - design my model to be LITERALLY ANY SIZE that happens to be divisible by 2 on X, Y, and Z axes, then center it on the build plate?
Can you please get with the program, here? I've likely been doing this work longer than you've been alive. I'm not even supporting Elon's demand, which is almost certainly unnecessary for this application.
Thanks for giving me more absurd examples. Your UV light is a 400nm wavelength or so. Or roughly 1/3rd a micron. The fucking wavelength of your curing light.
Now get outta here with your attempts at pretending that your $200 UV printer has the level of accuracy of three fucking wavelengths of the light it's using.
The size of the color red? That's 700nm wavelength, or 0.7 microns. Your resolution that you're printing here is no where close to the size of red-light photons.
Oh, so you don't know how light works either. Good grief man... light has a size and you're running up against the size limitation of the light itself. Especially because I know for a fact that these UV Printers are NOT using lasers, so you have no way to actually line up all the photons to hit the same location since their wavelengths are all unaligned.
In any case, car parts are not made at scales comparable to the wavelength of infrared light (ie: the "size" of a infrared-light photon).
Shocking narcissism, yet again.
You clearly have no intent to learn from your mistakes and pollute your entire argument with ad hominem and every other logical fallacy in the book - all wrapped up with a bow of dismissal of the original premise.
Oh, and by the way, light is both a particle and a wave. "light has a size" - indeed, the wave of light we aren't talking about has a size - called wavelength. Don't be afraid to use the most accurate terminology for your irrelevant responses! The wavelength has zero influence on the dimensions of the final product, as any wavelength more than a couple nm out of spec won't cure the resin at all, and there will be no object to measure. I think you know that and are just trying to win an argument by talking over the heads of the average readers on here - which doesn't help your case.
It's extremely likely you legitimately have a personality disorder, and are capable of much more if you clean up your act.
Wavelength has a very direct impact on the resolution you can print because it's an optical system. Under perfect conditions, it'll be diffraction limited, which is typically anywhere from several hundred nm to tens of microns. That's an ideal system though, you're actually going to be getting a dimensional accuracy somewhat above that in practice, probably tens to hundreds of um.
Please make sure Form Labs, and the rest of the companies I have worked for, are aware of how wrong their engineers are.
I'm not sure what the obsession is with arguing against the list of objective facts I have provided - each argument peeling away into a deeper and more obvious lack of understanding...
Please feel free to run anything other than the recommended wavelength of UV light through a photoreactive polymer resin and let me know the dimensions of your resulting print. Remember to do it twice, so you can compare the results - the point of this discussion. Repeatable results, to 1 micron of accuracy.
(your repeatable result will be a measurement of thin air, as your print will not cure - but feel free to try, as I've said.)
I couldn't find official dimensional accuracy specs for any formlabs machines except the 1, which lists 150um. Perhaps you're talking about the 3, which has a specified minimum spot size of 85um according to this paper. Where did they claim micron dimensional accuracy?
I don't care what the specs of the printer are. This is a discussion about repeatability.
I can get sub micron repeatability out of playdough with the right extruder and hardener. Every single one of you has been arguing from an entirely false premise to begin with.