The ruler is nice, but all of the lines look a little wavy to me?
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Yes, that is clear. Check out this compare and contrast with horizontal placement of ruler versus vertical.
This unit and its capabilities is not all the way dialed in. Will do some more tests regarding the lines.
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Just seeing items made of natural wood makes me drool 
and envy the work you are doing.
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Looking at the waviness of the lines closely looks like about 1/10 of a 1/16th inch for the raster cut where the head moves back and forth 6" and burns a spot segment of the line each pass. Better than my eyes will notice without magnification though not yet up to specs. (~0.007"?) I have no doubt that if it were a vector cut instead of raster the lines would be far more precise. It’s getting there.
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Is some of the waviness perhaps due to the grain of the wood? It would be interesting to see an acrylic one.
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Some is the grain. Some not. Wow. Have we shared a mind meld?
Check out what I posted here just now.
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Is this FFmpeg program or something different? ffmpeg is something great but I’m not all so crazy about the command line so I’m probably underutilizing it…though it is fast!
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The shifting could be due to you using a rolling cart and not securing your material/cart. The momentum of the head can cause everything to rock, especially if its at the right frequency and constant (which raster engraves tend to be).
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A good test of image placement accuracy is to engrave a ruler. Take everything out. Put it back in the bed wherever and attempt to engrave again EXACTLY on top of the previous engraving and see how far off it is.
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Thanks so much.
I hadn’t thought about point about the rolling cart. It is on carpet so it doesn’t roll, yes. I can push the corner of the cart and it wobbles slightly on the casters at the horizontal hub since the casters themselves aren’t solid. I will investigate a solution for stiffening up the cart, including removing the wheels. Or I could put it on the pool table, that’s solid! Not long enough hose though.
The print head does have some heft to it and the momentum could definitely shift the whole cart.
And engraving over the same piece. I will test that.
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Sweeeeet. Don’t use good stock though. Use some trash stock or MDF if you have it. That way the grain won’t get in the way of detail
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I think that if you put a Newton Cradle on top, it could be most amusing… 
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Oh yeah, try to NOT put in directly under the camera, put it horizontally and vertically offset from the center a bit.
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I’ve faced a similar problem with a 3d printer on a cart. Pipe insulation foam on the legs and then butting it hard up against a wall or solid object will help at least a little. It’s the X axis that will be the problem.
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Have you ever played Santa? Your contagious chuckle during the video was perfect…I didn’t think it sounded evil at all!
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X will be light with high acceleration and has one motor. Y is very heavy with slow acceleration and two motors. So the force when Y changes direction could be up to twice that when X changes direction. That being said resonances come into play when things shake so it can just depend on frequency.
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A REALLY interesting test would be to place the material near the far extremities of the bed, just to see how bad it can get. Based on what I saw in the Tested video, I bet it will miss by 1/4" or more.
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I was thinking Santa laugh when I heard it, too.
Edit: But I can understand if @marmak3261 is hesitant to push the limits of what the machine can do in its pre-production state, particularly when it concerns a feature that is likely to improve vastly by the time we get our production machines.
It would, however, be enlightening to see how far they have to go!
I ended up with one of my 3D printers, which is a hefty 300mm cube build area with dual extruders, having some ringing, so went and got one of the dot-matrix printer pads we used to use back in the day.
Put it under the printer which reduced some noise (stopped turning the table into a speaker) and some of the ringing as it damped vibrations a lot. You might try that, but yeah a rolling cart isn’t going to help.
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Yes, but mainly because I want to make things to show everyone and give away; but, sure, I want to give the Glowforge a chance to succeed first, something that is part of me from teaching so many years. The earrings are a hit and the rulers are all “make me one of those with my business information on it”! Just having to be patient at the moment to regroup after the certificate revocation problem. Will post specifically about that.
I was going to get a big anti-fatique mat but then I got the call and installed without it. I will take care of that today. I hadn’t seen the cart in person before picking it up on Saturday and I was surprised how small it look IRL. The Glowforge just fits but in actuality the sides of the lip of the cart are supporting the Glowforge as much as the runners of the Glowforge so it really is set to transfer case movement to the cart.
I’ll try to do a test on the cart to see how that affects it. Then I’ll put it on a big, solid cherry desk I have that should be more stable.
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