I actually create this model a long time ago, but never got around to publishing it.  This is a single print model that fits an Anko/Silvercrest style dehydrator.  The spacer with the hole allows for the M10 pneumatic tube fitting to attach from both ends.   This also allows enough clearance for a roller bearing horizontal spool holder/carousel to fit within.  Below is my model:

https://www.printables.com/model/1527114-dehydrator-spool-holdercarousel

Spacer is 323mm in diameter.

Printed in PETG.