Eventually I got a 2' x 4' piece. But not before ordering another one from somewhere else, so soon I'll have two. Oh well, I'll use both eventually.
What I need to do is transfer a pattern to the acetal for engraving it by hand, using a dremel router with a 1/16" mill bit. CNC engraving is not financially practical here--and for the patterns I need, a stencil will not work.
I had assumed on getting full-size pieces of adhesive paper, inkjet printing the patters on them and sticking them on. Cutting right through them, then peeling off the pieces. Is there a better way? My concern here is that the adhesive paper might stick too well to the acetal.
I know that heating adhesive-back labels with a heat gun helps them peel off easily, but the acetal is thermoplastic itself. There's also solvents that weaken the glue, but they also might harm the acetal.
I also have to buy a home-PC printer for this. I had assumed it'd be an inkjet, as they print on the widest variety of materials. The higher cost-per-page of an inkjet is not really a concern here. If there's a better method involving a laser printer instead feel free to say.