Ultrasonic cleaner for acrylic cuts: UPDATE

[evansd2]

I wonder where the brown is coming from? Additives to the acrylic?

Seems to me paper under the acrylic is carbon, and that smoke may redeposit.

Perhaps the think to do is elevate acrylic for flashback prevention instead of a back masking?

Like here:

Suspended ablation

When cutting acrylic, I’ve observed what looks a bit like chipping along the cut edges. It’s one of those things that once you see it, you can’t stop seeing it - so consider that before continuing with this post Initially it seemed random, such that some edges were clean and others beset with ‘chips’: [Drawing3] Root cause is the build tray. When the laser cuts through the acrylic and hits the metal grid of the build tray, some of the photons are reflected back up to the acrylic, cre…

So possibly dish soap both sides and elevate and see how that goes?