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Show HN: 3dasd – open-source DIY room-scale 3D scanner

3dasd.com

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Re: Show HN: 3dasd – open-source DIY room-scale 3D scanner

#21

Post by miahi »

dvoros wrote: post #2

Taking a break from my software developer job, I've started to work on my first ever hardware project and with too much free time on my hands it quickly turned into something bigger than I've anticipated. Working with a friend, we wanted to explore the use of 3D scanners on construction sites but quickly got stuck as no cheap hardware was available to fool around with. How hard can it be to build one I thought? I've…

Nice project! I did almost the same (Garmin v3 Lidar + steppers), but based on an ESP32 instead of raspi + arduino. The problem I have is the scanning speed vs resolution. The sensor is quite slow, so it takes a really long time to scan anything (hundred of hertz seems fast, but when you do the math you realize it's not fast at all).

Re: Show HN: 3dasd – open-source DIY room-scale 3D scanner

#22

Post by okamiueru »

dvoros wrote: post #13
okamiueru wrote: post #6

Cool project, and as an amateur tinkerer, I love to see these things open sourced and documented as there is so much to learn. I'm a little surprised by the nema motors, as they look overdimensioned for the task. Is there a good reason? Stability/precision?

I could justify that with being so standard that it's available everywhere but TBH that's just what my local electronics store had. (: I've also realized that it's probably overkill for the job and added a note in the documentation.

I think that's a good enough justification :) I was more curious if it came as a result of actually needing it. Btw, great job on the website and examples.

Re: Show HN: 3dasd – open-source DIY room-scale 3D scanner

#23

Post by bruce343434 »

This is really cool. I'm looking to build a body scanner so I can import a 3d model of my body. I can then use this model in Marvelous Designer to make shirts and pants and other clothes that will literally fit perfectly to my body.

I'm thinking of a platform on which you stand, with a rotating arm under it which holds the arduino which then scans up and down, the arduino relays the distance and both angles to a processor which turns the data into a point cloud and then into a 3d model.

Re: Show HN: 3dasd – open-source DIY room-scale 3D scanner

#25

Post by bruce343434 »

PicassoCTs wrote: post #18
dvoros wrote: post #12

Earlier quoted context omitted.

Yes, you're right, this is extremely low resolution, compared to commercial scanners. This is mostly the result of using a point-by-point scanner. One thing I have on my plate is exchanging that for a field-of-view scanner (probably a Livox Mid-40). One interesting feature of the current setup is the ability to "zoom in" on details. With the microstepping mode of the stepper motors, one can take 2/4/8 times as dense…

You could half it with a double header (one forward, one backward scanning at the same time)

quart it with a quadruple header!

Re: Show HN: 3dasd – open-source DIY room-scale 3D scanner

#28

Post by serf »

ur-whale wrote: post #24

How does this improve on taking a video with your phone and feeding it to one of the OpenSource 3D reconstruction packages (such as e.g. MeshRoom [1])? [1] https://alicevision.org/#meshroom

from my experience photogrammetry suites tend to produce results that are a lot more 'delusional' than measuring with an actual sensor, especially if you're photographing reflective/metallic/transparent surfaces.

Yeah, LIDAR is sensitive too, but usually the data is missing rather than random/delusional. Missing points tend to be less labor-intensive to clean up on the results than erroneous points that totally deform whatever mesh they're a member of.

Re: Show HN: 3dasd – open-source DIY room-scale 3D scanner

#30

Post by encypruon »

dvoros wrote: post #2

Taking a break from my software developer job, I've started to work on my first ever hardware project and with too much free time on my hands it quickly turned into something bigger than I've anticipated. Working with a friend, we wanted to explore the use of 3D scanners on construction sites but quickly got stuck as no cheap hardware was available to fool around with. How hard can it be to build one I thought? I've…

Great project and excellent presentation!

I've been trying to build something similar for tracking birds / panoramas / photogrammetry while avoiding using non-printed parts as much as possible but haven't been very successful so far. Because of that I'm particularly interested in the printed gears you are using. Maybe you could help me with some of my questions and concerns.

It looks like the whole thing is designed to be stiff, which means that the gears are pretty much at a fixed distance from each other. Doesn't that lead to backlash / play if the gears are a little bit too far apart or vibrations if there is too much pressure pushing them against each other? I've been worried about this and experimented with mounting the stepper motors on flexing parts to keep the pressure consistent and allow for more imprecision in the prints but I never really tried whether I can get away without that, so I'd be interested about how well this is working for you.

Pictures on the flexible motor mount idea: https://imgur.com/a/mM1Uql9

I would also like to know if there are any signs of wear after using the thing for a few days and what materials were used. I couldn't find anything on the type of filament on your website (did I overlook something?). I've only ever printed PLA so far and found that the gears would turn more smoothly after being used for a while. I imagine that the effect of wear might be different on the design without flexing parts.

Is it correct that the upper part is resting / sliding on "base-2"? Or is the bearing doing most of the work? Does it wobble at all? That was another one of the problems I had.

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