I’ve seen this question come up a few times recently and wanted folks to get the newest info. The new “set focus” feature has really changed things for working with thick material!
If you have something over .5" to put in your GF there’s no longer a need for complicated math or tray calculations. All you HAVE to do is make sure your materiel reaches above the height of the tray and is the cutting range and the GF will do the rest.
Here’s what to do…
Remove the tray
For material taller than 1.4", but less than 2", place it on the floor of the GF
For material less than 1.4", place it on something that raises it above 1.4", but is still UNDER 2". (See the handy tool file below to make this fool proof.)
Push the “set focus” button in the GUI and the GF will set the correct height.
That’s it! Now you can push the magic blue button.
Just a reminder for folks to never to put something inside the Glowforge that will exceed a height of about 0.6" with the crumbtray or 2" without the crumbtray. The air assist fan under the laser tube will hit the material and may completely dislodge the gantry from the rails.
except ‘set focus’ is ‘somewhere in the area’ of the box on the screen. and that box is a big area, so it’s not useful for something that is like 20mm x 20mm x 100mm. The red dot misses more often that it hits…
Thank you for this tool! I just loaded it into inkscape and had an idea to make a slight adjustment to “proof check” the material to ensure it’s not too short as sometimes getting a bead on the lines is tricky. I added a bump out at the lower threshold line with a curved corner so you can put it on the material and push down, if it slides off and the leg of the tool hits the bottom you know you need more spacers below.
[No-Math Focus Rule v1.3.svg.zip|attachment]
(upload://cQpcsb6nOjFfgXGKqjAurDjiARj.zip) (5.2 KB)
Yes I redid the calibration last week. I cannot get consistent results with Set focus. Ruined a cutting board just this morning because the print is so off center. Looked perfect before starting the print.
With a good calibration run, it should cut/engrave right where you put it then. Almost everyone has reported sub-fractional inch offsets (mine is within a score line width) - it cuts where dropped. Something’s up with yours. Calipers and manual settings seem to be your alternative until you hear from GF.