Add circle and measure as keychain size.

add one more circle the size 0.75"

and select both circles and align to verticle align centre.

Then combine as unite

Then array as the setting in image.

you can choose more row and colum as you want.

Add the rectangle to cut the whole jig.

Then cut as the setting.

and choose all keychins shape to ignore.

cut one more sheet for base.Then glue to top layer and 

base plate.

and press the weight ot use the clamp for 10 or more mins.

add image to engrave with the setting as I shown.

I choose the material setting as xtool prefered keychain

and then I add more power as 75 instead of 60.

75 power can get better result.

That's it.

Thank you