It Still Doesn't Register...

Registration: the alignment of multiple processing passes on the same sheet of paper, so a single multicolor or multiprocess image is produced. 

Coming from the world of photography and printing, I see perfect registration as a requirement to make sure my images and cut works line up so there's no offset of one color to another, or of image to cut. It's something I expect of any color printer — and which, until now, I expected to be standard for any cutting machine. If I have to manually align a paper for multiple passes, I'll set my program to print the registration marks which allow me to perform the alignment myself.

One of the issues I've been having with getting my Cricut to do what I want it to is its inconsistency in registering to the same spot on its cuttting mat, or — more importantly — to the material on the cutting mat. This is annoying because it makes it difficult to do precision cuts on unusual shapes, and to do registered cuts on preprinted materials — such as personalized cupcake wrappers and flags for an event.

Cupcake flag and wrapper for New Jersey Libertarian Party event

Cricut's Design Space has a "print and cut" feature which is supposed to make this sort of thing easy: print your design out onto an appropriate paper through Design Space, which adds registration marks to your graphics, and then cuts out the intricate shapes of your printed item.

There are some problems with this:
1. The maximum size of a print-and-cut graphic is about 9" x 6", which is nowhere near the size of the standard cutting mat, and a bit small for adult t-shirts.
2. The "print" part of print-and-cut is much too low a resolution to be useful
3. The "cut" part of print-and-cut either tries to cut out every single color change, causing the knife to shred the project, or only cuts the outlines of the printed portion (as if you were making a sticker), with no obvious option for anything different.

DIY'ing the sequence isn't much better. While you can print and adjust to the entire size of the sheet, the cutting will end up in different areas from one mat feed to the next. A few YouTubers have suggested that adding a bounding box at the edges of your image (or paper) will help with registration, but I've not found it a perfect match.

The red rectangle is my Cricut's DIY "registration" marks for US letter-size paper

That said, there's one additional step that looks like it might help (though it may "ruin" a mat): I ran an old mat through the Cricut several times with the bounding box set to "write" and found that my Cricut has a specific offset for 11 x 8.5" paper and cardstock (US standard letter size paper, matted landscape). If I set my letter-sized paper to the marks I've made on the mat, I'm getting something closer to a usable registration, if not what I would consider acceptable registration.

Registration Errors

Note that the bounding lines on the flags and some of the wrappers are visible, and how they vary from cupcake to cupcake.

On the plus side, after a lot of trial and error (and wasted cardstock), I got the Cricut to cut everything out without mangling the pre-printed images. On the minus side, I still had those outline marks. Since this was a bit of a test project, I went with the stock I managed to print out. For future events, I can "hide" the outline layer so it won't print, and my cupcake flags and wrappers should be perfect.