Introducing Lid Camera Calibration

#1

One of the most requested Glowforge features is a way to improve the alignment between the camera preview and the actual print on the software. Our team has been working hard to make this happen for you, and today we’re releasing an experimental beta tool that is available for everyone right now. We would be extremely grateful if you could try it out for us.

The tool builds on the data we gathered from the Snapmark experiment. It prints an entire grid of markings on a sheet of Draftboard, takes a picture, then measures its height in multiple locations to build a 3D model of the surface. All of this data is then combined with the calibration data we took at the factory to make your camera more accurate for future prints.

When you’re done, the Glowforge software will assess the results. If it’s more accurate than what you had before, it will be used; if it is not more accurate, it will tell you and not change the results.

The new calibration will then be used permanently, for all future prints, and should make the camera layout more accurate. However, once calibration is done, the flatness of your material makes a big difference in preview accuracy. The preview image is adjusted for a single height. You can choose where, and have your Glowforge measure it, by clicking Set Focus. The preview will be most accurate where you use Set Focus. Uneven material will be less accurate farther away from that spot.

How to recalibrate

You’ll need a 12” x 20” piece of material with no markings or stickers. It’s very important that the material be exactly 12” x 20”. The feature was designed to be used with a flat piece of medium Draftboard, used upside-down (with the sticker side down). It should work with other materials that are the same size and use the same print settings as well, like Proofgrade plywood, but we haven’t tested it on materials besides medium Draftboard yet.

To start, visit the Camera Recalibrator page and follow the instructions. It may take up to 40 minutes, depending on the speed of your wifi and internet connection.

Test and tell us how it works for you

When you complete the calibration, you’ll get instructions to test the results of your calibration. This includes a test target SVG that you can use. The mark should land near the preview.

Feedback and support

We’d love your feedback on this feature! If you try it, please post a reply in this thread with the material you used for your calibration and a screenshot of the lid image after your Set Focus test. We may not reply to all posts but we will read them all!

This is enabled right now for beta testing. If you need support, please reply in this thread - the engineering and support teams will be watching for problems. As this is an experimental beta release, email support is not yet available.

Snapmark

One other update - the Snapmark experimental feature made this possible, but there was still a tremendous amount of work to do to finish it. We decided to stop development of the Snapmark feature to develop this instead. You can learn more in this post about Snapmark status.

This post will be updated with changes and clarifications - thanks so much in advance for any feedback you can share!

62 Likes
Snapmark work stopped
Thanks to the new calibration feature I could attempt this bit of geekery
Feature Request: Show Material Height
My Snapmarks feature has disappeared
New image calibration corrected front/back displacement, but not left/right
Calibration made it WAY worse
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Had trouble with the lid camera calibration
Design not lining up on wood
Using Inkscape with the Passthrough :thinking:
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Snapmark work stopped
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Engraving left and/or off scale
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#2

Guys, this is THE BEST THING YET. Seriously. Look how close to the edge I was able to get on this cut!

27 Likes
#3

Here’s my overall bed image now. LOOK AT THAT PERFECTION, PEOPLE!

This is what it used to look like:

23 Likes
#4

Prior to calibrating my camera my prints were off by about 1/8 of an inch in the middle and 1/4 on the far left and right.

This is how the calibration really helped. I now can print spot on and can use my material more efficiently.

This is an amazing feature the team has developed…

15 Likes
#5

This works amazingly.


Before calibration.


After calibration.

One word of caution, make sure your material goes all the way to the bottom of the crumb tray. The way the red dot measure falls, I noted that it had gone off the material.

Thanks for this update.

18 Likes
#6

Woo Hoo! It’s a whole new ball game…

After re-calibrating, I am now getting consistent placement across the bed, with an offset of < 1mm – a 600% improvement over the factory calibration. :partying_face::tada::sparkler:

Upper left corner (500x zoom, metric scale)…
03%20PM

Center of bed on old scrap pendant blank (500x zoom, metric scale)…
32%20PM

Between this and Set Focus, my GF has evolved to a whole new level!
For me. YMMV. :roll_eyes:

12 Likes
#7

Great stuff! :slight_smile:

4 Likes
#8

Stonking update!!! Gone from 1/4 inch out to spot on.

Now if we can have a few more upgrades like this one that would be brilliant.

This is the best upgrade since I’ve had my GF

13 Likes
#9

I’m very glad to have known this before I ran the calibration on mine. It really does come all the way to the very front when it’s making all those marks! I lined my piece of Draftboard up with the frontmost edge of the honeycomb and it worked great.

And the results are wonderful. Calibration was always pretty good on my Glowforge but now it’s almost perfect! :slight_smile:

10 Likes
#10

Pretty hard to beat this…and that’s at the far right of the bed next to the tray edge…

Thank you Glowforge!

24 Likes
#11

Run it now!!! Best thing ever!

9 Likes
Introducing Snapmark (September 2018)
#12

MAKE SURE your material doesn’t have ANY paper sticking up along the edges! The process takes height readings there as well, and curled masking can trip things up.

This is great stuff, it feels like I have a whole new machine!

13 Likes
#13

This improvement is great! At 500 magnification, you cannot see any separation from the artwork and the actual score. This is not in the middle of the bed, but off to one side. After using set focus, I purposefully placed the target very near a void in the material so I could gauge how close to edges I could now put my artwork. The alignment is near perfect.
Thanks Glowforge team!

18 Likes
#14

Screwed up and this didn’t cut all the way through and it normally would have been a total loss. Now I was able to reload everything, eyeball the cut file and it was 100% dead on and I was able to cut the ornaments out. That was impossible before. Well done GF!

32 Likes
#15

This made mine way worse. After calibration and using PG Draftboard for both the calibration and then flipping it for the test target (even aligned to lower left corner again), my camera now doesn’t see the left inch or so of my material. So it was supposed to print in the upper left corner as indicated on the screen but you can see from the actual GF bed image I took, that it seems have somehow calibrated the left side of the tray out of camera range. Did it line up exactly after finishing yes, but one inch or so into the Draftboard as it seems to think that is where the upper left corner is now.

I wasted a coveted piece of PG Draftboard on this to make it worse and now am afraid to run it again with my last piece of Draftboard.

Ignore where the purple target is, I moved it out of the way when I realized what had happened on teh actual GF.

#16

Tanya, the left 3/4 inch of material is not accessible by the head, and doesn’t show up on the screen view. It’s never been visible, they only show us the printable area on the app.

That probably printed exactly where you placed it. The way that you can tell is if the purple preview falls right onto the resulting cut.

3 Likes
#17

My crumb tray has a high spot in the middle. How much will that effect this?

#18

GF%20Calibration

Well, I was super excited to read about this, but it still looks off about 1/8". But it’s a little hard to tell because the image is so fuzzy. Not sure if it’s much better or not…

#19

Congrats to the Glowforge team. An amazing update. Ran the cross hair test twice and double perfect alignment!!!

9 Likes
#20

Theoretically it will improve your alignment. It does a mapping of the entire bed. Try it and see.