To add to this here is a picture of the wedgie sled I have to cut segments for bowls. I used it to cut the bowl ring shown here. It easily will produce 45 degree cuts with a very high rate of accuracy. it is widely adjustable to just about any angle measured off the saw blade at the set up for the cut.
My sled is DYI, shown here with the digital angle ga set at 135 degrees to produce a 45 degree cut.
The glue up shown here is scrap pine example mini picture frane measures 4.5 x 4.5 inches.
You can get real great miters and if need be after cutting test pieces move the fence to dial in your product cuts.
The third pic is the length stop set in the miter slot, Other methods to control length would be the rip fence or a simple bloct set to the saw top with double sided tape
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