I don’t think it’s slump, I think it ablates more towards the surface. 2 pass cutting of acrylic fixes this issue and leaves much cleaner, straighter edges. Single pass cuts will always slope outwards towards the bottom unless you use so much power you get flashback
7 Likes
Yeah it does that too with a surface focal point, and it’s much more visible in acrylic. 
I’m going to try a second pass to get the slope (which might be a better word than slump) out of the way if I decide to mess with it again. I hadn’t thought to cut that out of the way, (good idea), but I have experimented with moving it through the focal point. Those results were so-so on the thin acrylic I was cutting.
It is melting some though as well…I’m getting differences between the surface and the base of the cut.
3 Likes
Here is the picture of the gf cut (black) and not gf cut (green). You can see here both edges inside have a visible line but it’s smooth.
1 Like
Then you can see here on the other side of both, the green, non gf cut is still smooth and the black gf cut its wavy. I’m not sure what side it was from as I wasn’t expecting any difference when I removed it and removed the sticker part.
I’m a beginner at this point, so I’m looking for “adjust this particular setting” type of information. The technical information is interesting but does not do a lot to help me at this point. I do want to learn but currently I would like to fix this problem.
5 Likes
Wow, I’ve never seen anything like that cutting acrylic on an Epilog machine.
1 Like
Looks like you’re using too much heat. Acrylic cuts very smooth normally. Is that 1/8"?
Now there is often a difference of cut quality and settings between cast and extruded. I’ve had issues with some colors, mainly black, with extruded acrylic…but nothing like that…
I cut on a Universal laser though. But have seen loads of acrylic cut on the 
that cuts perfectly fine.
Were your setting for cast or extruded acrylic? Because they are not the same as for cast…
4 Likes
I was using gf proofgrade, so whatever the machine auto sets it to is what I was using. It supposedly sets it “automagically”. Clearly not.
8 Likes
Oh…hmmm thats NOT supposed to happen then 
1 Like
No, that isn’t normal. The pics will help support to figure out what happened.
3 Likes
Try a test on the gf without the paper on it. See if that’s giving you that problem. Also try manually selecting “1/8 colored acrylic” from the menu and using those settings. I’ve had no problems with those on my cuts.
2 Likes
Contact support.
I’ve not seen that happen with Proofgrade black whether using automatic PG settings or my own settings. If you’re using PG black and PG settings, it definitely should not be doing that. It should be super crisp and clean.
2 Likes
Even the green doesn’t look like a normal laser cut acrylic edge to me. The surfaces should be flat right up to the edge. How big are these pieces?
By posting here, support has already been contacted. New threads create the same kind of ticket in the system as sending an e-mail.
Thanks, I wasnt paying attention to the section of the forum. Actually, I have this section on mute but I was tagged so I followed the notification I otherwise would not have received.
1 Like
As suggested, I tried removing the paper and selecting 1/8 in acrylic. It turned out even worse. It was picking up the pattern from the crumb tray. I was able to determine that the problem is coming from the underside.
4 Likes
This looks like the reflection of the beam off of the grid that burns the bottom of the piece that you are cutting. Your power is too high for that material. Try it with the power reduced or speed up the cut.
1 Like
Are you absolutely certain thats proofgrade acrylic??
1 Like
I don’t believe I am supposed to need to adjust the settings when using proofgrade, right?
Overall the black piece is about 2 -1/4 by 2 -1/4. The green piece is about 1 - 1/2 inch by 1/2 inch.
1 Like