I remixed the extension by Walter to add/increase the angle of the loft going from the inner to the outer diameters. It can be easily printed upside without the need for any support.
I included the F360 file too. If I did this again I would shorten it, and print two of them. That way you can basically do one extension for every spool you want to dry at the same time. Currently I can fit 1 full kg spool and maybe a .5kg spool at the same time if they are the thinner spools.
I also included the vector (.svg) file I created to cut the label for the filament types. If you have a cricut or a silhouette this will work great for you. Any other plotter should work too.
Link to dehydrator: https://www.amazon.com/Commercial-Chef-WFD100W-Dehydrator-White/dp/B075ZB3V9S/
.25, this doesn't really matter
No, set it up for 3 perimeters only.
Print it upside down, with the wider part on the print bed.
You will likely want a brim to help hold it in place. I set it up to print with only perimeters.
Printed on a SeeMeCNC Artemis.