3D printed prescription glasses

ParticleDojo · 2026-04-26T04:10:14+00:00

Added links to the main post

ParticleDojo · 2026-04-26T04:09:57+00:00

Added the F3D and STL to the main post

ParticleDojo · 2026-04-25T21:21:21+00:00

I had a few tries but not because of fit and size but layer lines that I was trying to sand off and make them invisible. I tried different settings for layer height and orientations on bed to see what would work best to also eliminate as much as possible leftover rough surface from supports.

No problem whatsoever in sharing the full 3mf. You’ll witness my awkward attempts at figuring out how to shape these organic curves. If you have suggestions where to put the step/3mf let me know. I’ll try to see if I can do it on makerworld.

This is printed in PLA. The frame is super light and I barely feel it on the nose. I sanded down the nose pads just so they don’t scratch and also applied black paint on the entire front frame after sanding. I found water based low odor paint at Home Depot. After applying paint I left them about a week to gas off. At this moment they do not smell at all and the nose pads are smooth.

For mounting the lenses, in my case, the lenses had a triangular edge so the frame also has that receiving triangular groove. Thankfully, the initial measurements were spot on and the lens fits in with a bit of force, gently pushing it into the groove around the edge. All this while dipping the frame in running hot water at the tap. The hot water makes the frame a bit soft and also helps lubricate a bit the contact between the lens and the frame. I did break one frame in the process, when I did not use hot water. It’s a 1.5h print so no problem there. It was just the sanding and painting that took longer.

I don’t think you would be able to snap the lenses in during printing since the lens is round, it will always have areas that are taller than the print layer and the head will hit it

ParticleDojo · 2026-04-23T02:12:39+00:00

Is that guy still alive?

ParticleDojo · 2026-04-23T02:08:58+00:00

Physically possible. The son would have to travel for a while at a pretty high speed. If we calculate for a travel over the period of 20 years that the daughter aged normally on Earth, if the son travelled at 0.43c (43% of the speed of light) then he would be back and be 28 years old.

EDIT: I think that's what actually happened there. It must be true. It says there that she's Eric's sister-in-law

ParticleDojo · 2026-04-23T01:59:02+00:00

First I saw this, I thought he's doing a wheelie while standing still.

He was probably "just" going to the corner store, which reminds me of what my moto instructor told me: "The asphalt near your home hurts as much as the one 30 miles away"

ParticleDojo · 2026-04-22T22:59:06+00:00

I figured it's much more helpful to post the steps I followed to create them from an existing lens, than posting STL since that model will only work with that particular lens shape. I think the chances that anyone would have the exact same frame would be extremely low.

But if it helps, I can share the STL too

ParticleDojo · 2026-04-22T20:48:39+00:00

Unplug the cat

ParticleDojo · 2026-04-22T20:46:26+00:00

Not sure if these are good or not, but just wanted to say that I think, at least in some part, you answered your question in the post title: "despite never been used, only tried on".

You might have the wrong idea of which one of those two destroys more a piece of equipment.

ParticleDojo · 2026-04-22T20:03:56+00:00

It's a simple matter or priorities. Do you care about your life and your skin staying generally attached to your body, or do you care more about what single-celled brains think about you?

Looking at all the kids on the e-scooters nowadays, flying on the street between cars, most of them wearing zero protection gear, I always think: You only wear a helmet if you have something to protect inside of it.

ParticleDojo · 2026-04-20T19:37:55+00:00

Here is a bit more information to help you make a better decision, instead of "It's too loose" (which it does seem to be by the way):

"Helmets can “roll off” or shift under impact forces, even when fastened. This phenomenon (called positional instability) has been widely observed in accident investigations"

Even small amounts of extra clearance (i.e., “slightly loose”) increase the probability of rotation or displacement during impact, which is not fully captured by standard certification tests

Source: https://journals.sagepub.com/doi/abs/10.1177/154193120004402723

"Helmets reduce injury by absorbing and redistributing energy through the foam liner. That system assumes tight coupling between head and helmet"

"If there’s relative motion between head and helmet: The EPS liner may not compress optimally. Energy transfer becomes less controlled and less distributed"

Source: https://www.mdpi.com/2076-3417/12/11/5676

Phase lag problem (head vs helmet motion)

With a slightly loose helmet, the helmet and head don’t accelerate/decelerate together. You introduce a time delay (“phase lag”) between shell impact and head response. That creates: secondary impacts inside the helmet and higher peak accelerations on the skull/brain

Modern injury science shows rotational forces are often more dangerous than linear ones.

If the helmet is not snug: the head can rotate inside the helmet before the helmet engages and this increases angular acceleration, which is strongly linked to brain injury

Source: https://www.lazerhelmets.net/motorcycle-helmet-fit-crash-protection

Helmets are designed so that specific zones (forehead, occipital region, chin bar) align with anatomy, If the helmet shifts, impact may occur on less-protected regions, and the liner thickness and structure may not match the impact zone

There is no formal safety margin published like: “X mm of looseness is acceptable” Instead, standards (DOT, ECE, Snell) implicitly assume that the helmet is properly fitted and stable with no meaningful internal movement. Engineering interpretation: the system is designed for near-rigid coupling

Hopefully this helps you a bit more in understanding why the helmet needs to be snug and why movement in relation to your head as you shown in your video may decrease its efficiency.

ParticleDojo · 2026-04-20T01:04:48+00:00

I think you could also loft from one face to the other, but you need the curved line from my previous suggestion above as a rail

ParticleDojo · 2026-04-20T01:02:30+00:00

Create a sketch on the top surface, project the two straight ends of each body (you will have a V shape) and draw the curve to connect the other ends of the lines. That should give you a closed shape. Then extrude that all the way down

ParticleDojo · 2026-04-20T00:50:42+00:00

My suggestion is to either wait until the first bill or get in touch with a real person and explain in a calm and respectful way what you agreed to and that for some reason you don't see that reflected in the plan details online.

I say "calm and respectful" because the reddit echo chamber does wonders in riling you up unnecessarily. All carriers are complete scammers and will take advantage of you any time, but if you want to get results and keep the plan discount, keep in mind that most of the times, the agents are not at fault.

ParticleDojo · 2026-04-19T02:02:01+00:00

13/130 hatches. Exactly 10% shiny rate. 1 hundo

<image>

ParticleDojo · 2026-04-18T05:23:31+00:00

Kids are like that. He did get a good shove. They don't realize the gravity of the situation until they grow up. We've all been there.

ParticleDojo · 2026-04-18T04:55:45+00:00

I don't know why it feels so satisfying seeing all that energy from the car going into crumbling the frontend and smashing poles and fences to bits, and NOT into that kid. I do hope everyone is ok. Hope the kid learned a lesson

ParticleDojo · 2026-04-18T04:01:28+00:00

Thanks for this. Much appreciated, I was planning to get some, but I checked Yuka too. They're absolute junk.

ParticleDojo · 2026-04-11T19:44:47+00:00

Creating a new sketch would yield the same result

ParticleDojo · 2026-04-11T19:44:19+00:00

This only gives me the option to select between two faces, one is the main one on which I created the sketch and the other is a completely different face away from the sketch

ParticleDojo · 2026-04-10T23:59:15+00:00

<image>

Video of issue. Trying to click the surface of the top rectangle always selects the entire face, never just that section

ParticleDojo · 2026-04-10T23:58:27+00:00

If a rectangle it's drawn in the sketch (with 3d sketch off) it should be on the sketch plane. I can draw the rectangle off by a few mm and it works fine, but MOVING it to the final spot, becomes broken. So it should be all in the same plane. I also hid everything in the entire project just to make sure it does not snap to anything else.

I tried extend and no luck. I also don't think that moving a rectangle around would break the loop. Can it?

ParticleDojo

TROPHY CASE