If it was me doing that many parts to a sheet I would not use tabs. I would secure the material board to my spoilboard using painters tape and glue. Sure it is a lot of preparation work but on the other hand I don't have to remove all those tabs after they are cut.
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Generally people cutting 8x4 sheets of material with lots of small parts don't use tabs in my experience. They have vacuum hold down or other methods as removing that many tabs is massively time consuming. I nest hundreds of sheets a week and I never use tabs for just that reason.
Try a test piece with an onion skin. I would cut these parts leaving a .005" onion skin and clean up with knife or a quick swipe with sandpaper. I'm not sure if you have vacuum though.
Yes we have good vacuum for holding down parts, however, I think they will still want to move on me considering that the individual part size is about 3.5''x4.5''. I agree that tabs will be very time consuming to clean up with this many parts...
.005" is really quite thick for some of the jobs I do. I am always surprised by how tough 2 or 3 thousandths is even in softwood and melamine. If you are working with plastic a deburring tool is a time saver during clean-up. If you have a tool changer you can run a finish toolpath with a smaller diameter bit to cut through the onion skin.
The problem with nesting is that what is efficient for a 4x8 foot sheet is not for a 1x1 foot sheet.
For this I started with the two pieces in the lower left corner. I added tabs in positions I knew would match up with arrayed copies of the pieces. I then used a linear array to array the two sub-pieces.
I also changed the toolpath order to cut the holes first while the board has integrity. And, in the job setup, I removed the 12x12 offset---any reason it was there?
I was using the OP's two tabs so you get all those triangular free-floating cut-off pieces. Fortunately I have dust extraction with great draw so they'd get sucked out of the way easily were I to cut this.
Each piece is attached to another piece and each diagonal strip is attached to what little waste remains as a frame around the pieces. I wouldn't want to cut these pieces out with a 1/4" compression bit in one pass at full 3/8" material thickness but that was not part of the brief...