I generally double hoop them for the next project, making sure the holes fall over or under a solid piece. If it is wash away, a little water on a paintbrush will stick them together. If I am doing a layered design, I naturally use the smallest bit that is appropriate on each layer.
The wash away crumbs can be dissolved into a fabric stiffener or glue.

Good idea. I never thought of that. I have to remember that the next time I have left overs.

This works!!! It is great to use up the scraps of it. I can't see throwing it out because they are still good sized pieces.

If They are small unusable scraps of tear or cut away they make great scratch paper, really easy to write on.

I use my leftover stabilizer pieces by spraying them with craft bond or 505 and adhere them to the piece already in the hoop (covering the hole from last project). Seems to work fine. I haven't had one problem.

I save any leftovers that are at least 3" sq. I embroider alot of napkin corners and use my smallest hoop. Needless to say, I have drawers and bins full of scraps!!
Just can't bring myself to throw them out.

i just reuse mine overlap them and that way i don't feel so bad about land fill issues

I just trim out the used part to make it neater and baste in a patch area. Works great and can use the outter edges over and over. Waste not, want not!

My mother in law said to use coffee filters for stabilizer. Maybe that works, but this machine cost me more money than I care to say so I will use stabilizer, thank you very much. I buy the iron on stabilizer at Joann's with my 40% coupon and use it to "stick" the other stabilizer onto my pieces to be embroidered. I hate the spray stuff that smells terrible and gunks up my needles. This iron on stuff does the trick and is reusable if you don't sew into it. It is also good to use a full piece to double up on stabilizer when you need it.

I save the tear away pieces, cut them into strips and use them as backing when doing borders with the built in stitches. After years of ignoring them, I'm getting more into using the built in stitches to frame the embroidery design and/or as decorative borders.