1 Topic by mmdstudent19 (edited by mmdstudent19 2019-03-27 07:59:59)

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Topic: 3D Scan while 3D printing

Hello everyone!

I have joined this community to share my knowledge and experience and gain knowledge and experience from you guys about 3d printing and its branches. Currently, I own a cheap DIY 3d printer at home (3DOF FDM) and also have access to a DIY 5 axis 3D printer (FDM) at university. My primary reason to be here is that I am looking into building (or buying) a 3D scanner for the 5-axis 3D printer to allow me to scan the model while it is being manufactured . I will be looking into any ideas as long as it is feasible to make (maybe using cameras? lasers?). If you guys have any experience please donnot hesitate to contact me or post. Also if you know any good forums, research papers, youtube videos or even soliforum subforums, id be happy to look into them.

cheers, hope you guys have a good day!

2 Reply by carl_m1968

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Re: 3D Scan while 3D printing

You can not scan an object in real time like that. The technology does not allow capture of a changing scene. You might as well just video it. Scans consist of stationary captures that are layered on each other to get the best possible point cloud you can. That's why scanners such as the Atlas and others make multiple passes of the same object. If the points on the model are changing then it will corrupt the point cloud and then texture file will not be created correctly.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

3 Reply by Tin Falcon

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Re: 3D Scan while 3D printing

What are you trying to accomplish with this project.?   

If you are trying to document the quality of a print layer by layer then a camera would be the way to go. this has been discussed as an option with the latest E#d project.

Soliddoodle 4 stock w glass bed------Folger Tech Prusa 2020 upgraded to and titan /aero extruder mirror bed
FT5 with titan/ E3D Aero------MP mini select w glass bed
MP Utimate maker pro-W bondtech extruder
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4 Reply by mmdstudent19

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Re: 3D Scan while 3D printing

carl_m1968 wrote:

You can not scan an object in real time like that. The technology does not allow capture of a changing scene. You might as well just video it. Scans consist of stationary captures that are layered on each other to get the best possible point cloud you can. That's why scanners such as the Atlas and others make multiple passes of the same object. If the points on the model are changing then it will corrupt the point cloud and then texture file will not be created correctly.

Let's suppose we are printing, is it not possible to attach the laser line diode and a camera to the side of the extruder and create a point cloud for that face? and use the movement of the carriage to map the object as it gets built up?

I don't have a lot of knowledge about point cloud systems but I'm working into it to understand the concept, so apologies if what I'm saying are theoretically impossible smile

5 Reply by mmdstudent19

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Re: 3D Scan while 3D printing

Tin Falcon wrote:

What are you trying to accomplish with this project.?   

If you are trying to document the quality of a print layer by layer then a camera would be the way to go. this has been discussed as an option with the latest E#d project.

I'm just trying to create a 3d scan of the print as it prints, so we can use the point cloud method to detect the irregularities in the print.

6 Reply by Tin Falcon

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Re: 3D Scan while 3D printing

IMHO their are better methods of detecting irregularity in the printed surface. the eye and the fingernail are great tools god gave us all.


As far as using the motion controls to record data you would need position sensors on the motors. 3d printers are an output device.
and would need to b modified to provide any input.

Soliddoodle 4 stock w glass bed------Folger Tech Prusa 2020 upgraded to and titan /aero extruder mirror bed
FT5 with titan/ E3D Aero------MP mini select w glass bed
MP Utimate maker pro-W bondtech extruder
Marlin/Repetier Host/ Slic3r and Cura

7 Reply by knowack

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Re: 3D Scan while 3D printing

I think creating a point cloud of an object as it's being printed is going to be a huge amount of data.  As Carl said, you'd have to repeatedly scan the object with subsequent layers.  Then the question becomes: is your method of scanning going to be sufficiently accurate to detect the anomalies?

I would think a high-resolution optical approach would be more practical.  Software could then look for pixel artifacts that indicate gaps, layer irregularities, etc.

In the end, I have to go with Tin Falcon on this one, and ask "why?"  A decent printer is going to make quality prints with a high degree of reliability.  When I start a print on my printers, I don't even wait around to see if they're going to adhere..I know they will...and when the requisite print time is over, I'll return to a quality printed object.

You indicated that your experience has been with DIY printers.  I suggest your base of experience is skewed, and you may be mistrustful of the quality and consistency of the prints you've encountered.  Obtain access to a quality printer, and see if the resulting output assuages your perceived need to 'validate-scan' a print as it's being produced.

-Kevin

8 Reply by carl_m1968

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Re: 3D Scan while 3D printing

knowack wrote:

I think creating a point cloud of an object as it's being printed is going to be a huge amount of data.  As Carl said, you'd have to repeatedly scan the object with subsequent layers.  Then the question becomes: is your method of scanning going to be sufficiently accurate to detect the anomalies?

I would think a high-resolution optical approach would be more practical.  Software could then look for pixel artifacts that indicate gaps, layer irregularities, etc.

In the end, I have to go with Tin Falcon on this one, and ask "why?"  A decent printer is going to make quality prints with a high degree of reliability.  When I start a print on my printers, I don't even wait around to see if they're going to adhere..I know they will...and when the requisite print time is over, I'll return to a quality printed object.

You indicated that your experience has been with DIY printers.  I suggest your base of experience is skewed, and you may be mistrustful of the quality and consistency of the prints you've encountered.  Obtain access to a quality printer, and see if the resulting output assuages your perceived need to 'validate-scan' a print as it's being produced.

-Kevin

I agree with Kevin. If your machine is calibrated and setup properly you should not have to watch or check on it. It should just work. Like Kevin, I load a print, start it, and go about my business. I know it will adhere and I know it will have no issues.

Your problems could be machine related, model related, filament related, or user related. Not all models found on the web are printable. There is some knowledge needed in knowing how to place a model, if a skirt is needed or not for added adhesion. How much adhesion is needed given a parts size and height and so on.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.