Extended HarvestRight Tray stacker
thingiverse
The tray stackers by Revar are the same height as the ones from freezedryingsupplies.com which still isn't very tall. I extended his model to make it taller. If your food hits the bottom of the tray above on these corners, it won't fit in the freeze dryer. This has been a great gauge for us as we fill our trays.
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