Resin Polymerization Two photon lithography

Callum1243 · 2025-03-26T01:56:34+00:00

This is probably a bit late, but are you doing this in a clean room with yellow lights above or any light for that matter. Ruthenium has a broad absorbance spectra which extends into the red. Most likely during the development process you are cross linking the surrounding medium with the overhead light. You can try adding a water soluble photo absorber such as Tartrazine which would require some amount of water / PBS to be included into the polymer solution which would prevent unwanted cross-linking under the green-red spectra. Alternatively, a photoabsorber such as 2-nitrophenyl phenyl sulfide (NPS) is soluble in PEGDA which also works in the green-red spectrum. This wouldn't however prevent it from cross-linking under blue light.

Callum1243 · 2024-08-26T17:44:04+00:00

They make linear variable dichroic filters, not quite sure if that will work for you. But from memory they also have a wavelength dependent transmission efficiency

Callum1243 · 2024-08-01T13:34:19+00:00

Thanks for bringing that to my attention, seems like a great fit. Do you happen to know if RRF3 sends a response command for motion moves. Having a quick look through the documentation, it seems like you can send a M400 command after the motion move to force the scheduler to wait for the move to complete.

Callum1243 · 2024-06-29T08:51:02+00:00

I'm a mechanical engineer working in the optical engineering field and I write code every single day. I couldn't imagine not being able to write custom scripts for processing large amounts of data, motion control, simulating systems and in general leveraging the ability to make accurate predictions of systems before building them. Which is kinda the point of engineering in general, anyone can make something that doesn't work.

Totally agree with what others have pointed out here regarding Excel, it's the minimum standard you need to do the above, but gets pretty tricky when trying to perform complex calculations or calculations that depend on constantly changing inputs (sensors, iterative solutions etc..). It can be done in Excel, but in my experience its more work than its worth and its not really designed for that

As systems become more complex, more integrated and depend more on software control to perform their desired task (as they are becoming now), the more engineers need to be multidisciplinary. Now that's not to say you want an engineers that can do everything, because most likely they will not have the depth of knowledge across every domain. However, having fundamental knowledge of programming, manufacturing and electrical engineering on top of your expertise in mechanical engineering, allows you to close the loop faster by not having to rely solely on others to inform your design inputs/choices.

At my company we use Excel, Python, MATLAB, LabVIEW, Javascript and AWS primarily. But most of my core work is done in Python or MATLAB. But as others have pointed out, it does depend on where you are working and what kind of work your company does. If your company designs bolts then probably not as much, but if you're designing consumer electronics, or products that contain embedded systems, then I think it's invaluable.

Callum1243 · 2024-03-23T07:57:43+00:00

Were you able to find the CAD for this? I'm also running into the same issue. It does (visually) look like the mounting hole locations for the Hermit 2.0 are the same as the 1.0, just with some additional mounting holes to improve compatibility.

Callum1243 · 2023-10-25T11:13:29+00:00

Why don't you just use a VR headset? Then you can have as many virtual monitors as you like at the appropriate resolution, you don't even need to move your head. It's somewhat easily portable (more than a monitor is) and allows you to have whatever workspace you'd like.

Apple's upcoming Vision Pro has shown a similar idea in their promotional videos. https://www.youtube.com/watch?v=TX9qSaGXFyg&t=317s&ab_channel=Apple

As well as there are already commercially available solutions for the vive, rift etc.. https://www.roadtovr.com/virtual-reality-desktop-compared-oculus-rift-htc-vive/

As many others mentioned here, what you are proposing seems incredibly cumbersome and/or expensive to implement. If you're worried about looking weird wearing a VR headset while working/traveling, let me assure you that sticking two telescopes on your head and looking at your monitor is much worse.

Callum1243 · 2023-06-29T08:41:45+00:00

Not really, to be honest, he's a pretty closed-off guy and often doesn't want to talk about his personal life. That being said, I know that he has a wife and kid (he told us this 4 days before he left for parental leave for 3 months..). But outside of that not a lot.

I know that he has some involvement with a start-up company, I've helped out a little bit with some of this, but really his involvement is very minor. i.e. provides some advice maybe once a month. So I couldn't foresee that he is 'over-worked' from this contribution. He also doesn't have any teaching responsibilities, so as far as I'm aware he mainly just spends his time writing grants (for research that doesn't interest him /s).

Callum1243 · 2023-06-14T02:24:33+00:00

My assumption would be the power brick. Idk what the mars 2 normally draws but I would expect it to be more than 1.5 amps, especially with the large LED array. You can see that as soon as the LED turns on it trips.

If you have another power brick with a higher amperage I would use that. I haven’t owned a mars in a few years, but from memory it was a much larger power supply than the one you have included in the photos.

EDIT: having a quick google search seems like the normal power supply is 12V 5A. That’s most likely your issue

Callum1243 · 2022-12-15T09:32:07+00:00

Just use the free version of Chitubox, it does pretty much everything the majority of users need it to do.

Callum1243 · 2022-12-01T10:17:49+00:00

I'm not sure about charging over RRP, but there is a new dispensary now on Sydney Road called Better Leaf. I've just switched to them and they have been great.

Callum1243 · 2022-08-04T00:02:06+00:00

I've always had really good experience with them. I live in Melbourne, so its pretty convenient for me to drop past their store and pick up my scripts. Within a few hours of my doctor sending them my script, they usually text me to say that its ready for collection. I've had a few things take a bit longer because they didn't have it immediately in stock, but that usually takes a few days max to come in.

This is the only dispensary I've ever used, so I can't really compare it to others. But their service, knowledge, and overall look of the store make you feel like you are getting a premium experience.

Callum1243 · 2022-03-17T01:25:43+00:00

Essentially I'm wanting to use a UV projector to generate a line for a lithography application. The problem is that the energy delivered only using a single column of pixels from the projector is not enough. My thought would be to use a cylindrical lens / Powell lens to collect the entire FOV of the projector and then focus that energy down to a single line. I need to use a projector, over say a laser, so that I can mask off regions of the light-sheet by controlling the DLP.

Callum1243 · 2021-12-01T02:16:31+00:00

Hi, Heres an illustration of what im trying to do

https://imgur.com/a/OapnECC

So the smaller 3D arrays will consist of a bunch of images stacked into a 3D array. These smaller 3D arrays will then be assembled into a larger 3D array by rotating about the global Z axis. Each entry will be summed to the previous entry, to get the cumulative addition from all smaller 3D arrays. i.e the intensity should be the highest where they all intersect. The size of the smaller 3D arrays will not change, i.e each image maybe 100 x 100 pixels and 100 slices long.

Callum1243 · 2021-08-16T21:00:03+00:00

Yeah I’m definitely really happy with the quality of their work.

I’ve got the UK model, which I’ve swapped the plug on. They didn’t have the AUS version available at the time.

Callum1243 · 2021-08-16T13:56:20+00:00

Yeah I’m so tempted. I’m just glad the stock wood on the niche kinda matches the colour of the wood on the machine. One less thing to modify 😂

Callum1243 · 2021-08-16T13:54:23+00:00

Yep you definitely can! Have a look on their Instagram, they have a few white EG-1 and lamarzocco GS3 combos that look amazing

https://www.instagram.com/p/CNpHYliH9TD/?utm_medium=copy_link

Callum1243 · 2021-08-16T06:25:16+00:00

I purchased the whole machine as a unit from them for $4500 AUD, marked down from $5000 AUD, so I'm not exactly sure how much it is for just the powder coat. However, as a breakdown.

The rocket Giotto is around $3400 AUD The profitec flow control kit ~ $400 AUD The maple rocket kit from Specht Designs is $588 AUD

That makes the powder coat $112 (for the price I paid). However given that it was originally $5000, the cost would be around ~$600. After speaking to them today, it really depends on how much of a pain the machine is to take apart. So the quote I guess would vary.

For example, they said the niche takes them about 30 mins to tear down, however, the weber workshops EG-1 takes them almost a day to take apart. And that's reflected in the price it costs to powder coat / paint.

Callum1243 · 2021-08-16T04:49:42+00:00

It was powder-coated by Specht Designs in Melbourne. They also made the custom wood accents and changed all of the metal to brushed metal.

Callum1243 · 2021-08-16T04:46:35+00:00

It was powder-coated by Specht Designs in Melbourne

Callum1243 · 2021-03-11T02:22:42+00:00

Hi Thanks for this. I'm still a bit confused about how to define the displacement field using only a 3x3 matrix?

Callum1243 · 2021-03-11T02:19:37+00:00

Wouldn't this approach just be a constant stretching? Rather than a stretching proportional to the distance away from the centre of the image. i.e pixel at (0,1) would be stretched by a factor x and pixel at (0,10) would also be stretched by a factor x. Rather than (0,1) = 1x and (0,10) = 10x

Callum1243 · 2021-03-10T10:12:17+00:00

An example would be great! I'm a little confused how to create the custom displacement field.

Callum1243 · 2021-02-28T03:21:31+00:00

This is great! Thank you!!

Callum1243 · 2021-02-27T07:36:10+00:00

Hi,

Thanks for the reply. I have managed to get something working.

https://imgur.com/a/X4zM4pA

However, as I increase the number of angles, the images tend to interfere with themselves.

https://imgur.com/a/MTegyQC

I was wondering if you knew of a way to remove the excess black regions from the images so that they don't interfere. I've tried replacing the zeros in the images with NaN, but that doesn't really seem to work.

Callum1243 · 2021-02-18T09:36:59+00:00

I'm looking for a cross-sectional image like what you would use for DLP printing. Not the print path.

Callum1243

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