Technologies

Is Your iPhone Good Enough to Be a 3D Scanner?

For creating 3D printer files, your options include smartphone apps or expensive standalone scanners.

Most 3D scanners are handheld devices that scan small to medium-sized objects with a high degree of accuracy. The resulting files are used for 3D modeling or 3D printing and they can produce fantastic results — if you’re patient and willing to learn how to use them.

These scanners, like the popular Revopoint Pop 2, can cost $700 and have a steep learning curve. Alternatively, if you own an iPhone 12 Pro or higher you can almost recreate what a fancy 3D scanner does. It isn’t quite as accurate, especially for 3D printing, but if you spend some time tweaking, the output can be just about as good.

Read more: Best 3D Printer

Creating 3D prints from files uploaded to communities like Thingiverse or Printables is fine, but once you can scan and recreate real-world objects, there’s no limit to what you can create. For example, you could replicate a collectible figure or scan a broken mechanical part to recreate it.

Revopoint Pop 2 3D Scanner $699 at Amazon

Using a 3D scanner

Pros:

Can capture detail down to 0.1mm
Dimensional accuracy is excellent
Very little clean-up when you succeed

Cons:

Often costs more than a 3D printer
Software is often very hard to use
Creating a usable model is painfully difficult

3D scanners use reflected light — sometimes in the form of lasers — to map the surface of an object. The scanner uses two cameras to judge depth and create a «point cloud» that can be fused together to make a solid object. That solid model is often incredibly accurate down to the smallest crack or imperfection.

But scanning an object can be difficult. The scanner needs to be the right distance from the object you’re scanning at all times, and the object has to be the right color and reflectivity as well. Often, you will need a 3D scanning spray to coat your model in a white, evaporative coating to make scanning easier. This is not possible with human subjects, but does help with inanimate ones. Or at least it should.

I’ve spent hours using 3D scanners and struggle every time to produce a model that could be 3D printed. Often a scan will lose connection, then restart in the wrong place, causing severe disruption. After a lot of trial and error, I’ve managed to get several usable models, but the amount of work it took just didn’t seem cost-effective.

iPhone 12 Pro (renewed) $528 at Amazon

Using your iPhone

Pros:

Incredibly fast scanning
Models are instantly usable as online resources
You likely already own one

Cons:

Lower detail and quality
Can need a lot of clean-up to make it 3D print-ready

polycam shoe scan — James Bricknell/CNET

iPhones have a lot of cool technology that makes them excellent 3D scanners, including good cameras for photogrammetry and lidar technology for larger objects like cars or the inside of your home.

Photogrammetry is the best way to create a fully realized 3D model if you want that model to only exist digitally. It uses multiple pictures — the more pictures the better — to create a realistic facsimile of an object. The depth mapping is far rougher than a 3D scanner, but the textures and photo imagery make the model look extremely detailed. As you can see, the shoe in the image above looks identical to the real thing when the textures are shown, but the model I 3D-printed from it has lost a lot of its details.

A purple 3D-printed shoe — James Bricknell/CNET

The coolest thing about photogrammetry, especially on an app like Polycam, is that it can be used with any camera you have, including DSLR cameras and even drones. You simply upload as many images as you want to the Polycam app and it will spit out a 3D rendering of the object you took, whether that’s a shoe or the Grand Canyon. It even works with Android phones, though none of those have the lidar technology like the iPhone.

A 3D rendered mailbox using Polycam — James Bricknell/CNET

Lidar only works if you have an iPhone 12 Pro or later, but it’s excellent for scanning larger objects like mailboxes, pool tables and even cars. It works a lot like an expensive 3D scanner — by bouncing light off an object and measuring the distance the light travels — but it has a much lower resolution. This makes it excellent at scanning large, simple objects, especially if you’re keeping them as digital models.

Both photogrammetry and lidar imagery are extremely easy to use on your iPhone and require very little technical know-how to get right. They both need an app though, and after using several different ones, I found Polycam is the best choice.

Polcam for iPhone and Android $80 at Polycam

Polycam costs $80 a year and offers both lidar and photogrammetry. More than that, it uses those systems in some really fun ways. Not only can you scan objects to create 3D models, but you can scan the walls inside your house and build a 3D floor plan. You can even 3D print that floor plan complete with walls, stairs and window and door openings.

When scanning an object on Polycam for 3D printing I was able to get good quality, low-resolution scans for organic shapes and much better scans of simple objects. Using Polycam to scan a broken sliding door handle was quick and simple and allowed me to accurately replicate a replacement. In fact, if you’re used to using programs like Blender — a free 3D sculpting tool on the PC and Mac — or Nomad Sculpt on the iPad or iPhone, you can import the Polycam file and spruce it up before printing.

Should you buy a 3D scanner if you own an iPhone?

I’ve spent a lot of time with several different 3D scanners and they all have the same inherent flaw: They’re just too picky to work for consumers. In a commercial setting, where everything can be controlled and your day is dedicated to getting this machine to work perfectly, then sure, a 3D scanner makes sense. If you’re a hobbyist though, with a life that requires more from you than endless hours of slow scanning, an iPhone is a better option.

Even if you don’t own an iPhone, you can pick up an iPhone 12 Pro — the first with lidar — for around $550, several hundred dollars cheaper than a 3D scanner. And once you’re done 3D scanning shoes, mailboxes, cars and houses, you still have an iPhone that can do a hundred other things too.

More on 3D printing

Technologies

Harvard Business Review Study Finds ‘AI Brain Fry’ Is Leaving Workers Mentally Fatigued

Study participants reported increased mental fatigue while using AI tools, but less burnout overall.

Workers who excessively use AI agents and tools at work are at increased risk of mental fatigue, according to a recent Harvard Business Review study. In certain industries, more than 25% of hired professionals report increased mental strain due to their role in AI oversight — though these professionals also generally experienced less burnout than peers who aren’t using AI.

This phenomenon — which the researchers refer to as «AI brain fry» — is described as a «‘buzzing’ feeling or a mental fog» that caused study participants to develop headaches and difficulty focusing and making decisions. Individuals pointed to being overwhelmed by large amounts of information and to frequent task switching as the reasons for these feelings.

Studied individuals experienced more brain fry when they utilized AI agents to manage a workload beyond their own cognitive capacity. When participants used AI to replace mundane, repetitive tasks, managing the growing number of tools led to increased mental fatigue.

Crucially, the study found that fewer individuals who used these AI agents reported workplace burnout.

The researchers predict that this is because burnout testing assesses emotional and physical distress. In contrast, they report, acute mental fatigue «is caused by marshalling attention, working memory and executive control beyond the limited capacity of these systems.»

These are the processes that are taxed when study participants use multiple AI tools in their workflow, according to the researchers.

The Harvard study identifies several business costs incurred by workers suffering from AI brain fry. The foremost consequence is that these individuals may end up making lower-quality decisions. «Workers in [the] study who endorsed AI brain fry experience 33% more decision fatigue than those who did not,» the study reports. Workers who report AI brain fry were also more likely to self-report making both minor and major errors at their jobs.

Another recent Harvard Business Review study similarly found that employees who use AI tools «worked at a faster pace, took on a broader scope of tasks and extended work into more hours of the day,» but warned that «workload creep can in turn lead to cognitive fatigue, burnout and weakened decision-making.»

Technologies

Today’s NYT Connections Hints, Answers and Help for March 11, #1004

Here are some hints and the answers for the NYT Connections puzzle for March 11, No. 1,004.

Looking for the most recent Connections answers? Click here for today’s Connections hints, as well as our daily answers and hints for The New York Times Mini Crossword, Wordle, Connections: Sports Edition and Strands puzzles.

Once I spotted «ice cream» and «traffic» in today’s NYT Connections puzzle, I had the blue category all but filled in. But that purple category was even more bizarre than usual. Read on for clues and today’s Connections answers.

The Times has a Connections Bot, like the one for Wordle. Go there after you play to receive a numeric score and to have the program analyze your answers. Players who are registered with the Times Games section can now nerd out by following their progress, including the number of puzzles completed, win rate, number of times they nabbed a perfect score and their win streak.

Read more: Hints, Tips and Strategies to Help You Win at NYT Connections Every Time

Hints for today’s Connections groups

Here are four hints for the groupings in today’s Connections puzzle, ranked from the easiest yellow group to the tough (and sometimes bizarre) purple group.

Yellow group hint: Bring that back!

Green group hint: Fancy ____.

Blue group hint: Think of a certain shape.

Purple group hint: Sounds like…

Answers for today’s Connections groups

Yellow group: Steal.

Green group: Make nicer, with «up.»

Blue group: Kinds of cones.

Purple group: Pronoun homophones.

Read more: Wordle Cheat Sheet: Here Are the Most Popular Letters Used in English Words

What are today’s Connections answers?

The yellow words in today’s Connections

The theme is steal. The four answers are lift, palm, pinch and pocket.

The green words in today’s Connections

The theme is make nicer, with «up.» The four answers are dress, jazz, spiff and spruce.

The blue words in today’s Connections

The theme is kinds of cones. The four answers are ice cream, pine, snow and traffic.

The purple words in today’s Connections

The theme is pronoun homophones. The four answers are hee, mi, oui and yew.

Technologies

Today’s NYT Connections: Sports Edition Hints and Answers for March 11, #534

Here are hints and the answers for the NYT Connections: Sports Edition puzzle No. 534 for Wednesday, March 11.

Looking for the most recent regular Connections answers? Click here for today’s Connections hints, as well as our daily answers and hints for The New York Times Mini Crossword, Wordle and Strands puzzles.

Today’s Connections: Sports Edition features a real mix of categories, but the yellow one came easily to this Seahawks fan. If you’re struggling with today’s puzzle but still want to solve it, read on for hints and the answers.

Connections: Sports Edition is published by The Athletic, the subscription-based sports journalism site owned by The Times. It doesn’t appear in the NYT Games app, but it does in The Athletic’s own app. Or you can play it for free online.

Read more: NYT Connections: Sports Edition Puzzle Comes Out of Beta

Hints for today’s Connections: Sports Edition groups

Here are four hints for the groupings in today’s Connections: Sports Edition puzzle, ranked from the easiest yellow group to the tough (and sometimes bizarre) purple group.

Yellow group hint: Super Bowl champs’ division.

Green group hint: Baseball stats.

Blue group hint: Stars on ice.

Purple group hint: You wear it around your waist.