Universal filament spool cradle with endcaps

This is my universal version of Pwnas' adjustable spool holder. I
can drop any of my spools onto it without the need for adjustment.
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The mosaic feet are his original design based on the work of
bwevans. I found that my threaded rods had rough ends where I
cut them and created the endcaps to cover them and prevent
them from scratching people and nearby things.
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I used mike_linus' "NUT JOB | Nut, Bolt, Washer and Threaded
Rod Factory" as a starting point and com