I made these (3 total from 1 stir stick) to go in my sewing box that I have made out of an unused tackle box to solve my tangled mess issues (visible in the first image lol).
What you need:
Wooden or Bamboo skewers
1 paint stir stick (mine was left over from sherwin-williams but any should do)
Thread spool(s) (the widest/tallest ones you intend to use on the stand)
Marking tool (pencil, or sharpie)
Drill and drill bit
paint or stain(optional)
First begin by measuring the inside of your box, at the smallest point in the direction you want your stick to lay. Mine measured 6 3/8" (actually because my box narrows at the bottom very slightly, it was little less than this)
Then take that measurement and mark off sections on your stir stick, one stick for me was 3 of this measurement.
Then trace your spool of thread between those marks, keeping the marks as close together as possible for a tight fit. Mark the center hole so you know where to place your skewers. I could fit 4 thread spools, and a bobbin area at the end.
Next, place the flat side of your skewer on the table next to your stir stick.
Slide your thread spool over it so that it rests on your stick, then mark above it so you know how tall to cut your skewers.
Once one area has been marked, you can take that mark and hold it up to the other skewers so that you have markings of the same distance. Like this:
Use your saw to cut your lengths of paint stick and your skewer lengths.
Test fit your lengths of paint sticks to ensure they fit as you want, I had to trim/sand a little further in because the base of my box narrows toward the bottom.
Measure your fattest skewer against your drill bit to ensure you have the right size, slightly larger is okay the glue will take care of the rest. (Ideally they're all the same but I've never found this to actually be true.)
Drill your hole, only go about half way through the stick so the back remains intact. It will be quickly done, for me it was only about a 1 second count.
Sand your holes, and your stick edges to remove any roughness that might splinter then do another test fit to ensure you do not need to sand further.
When this is complete, fill the holes with wood glue and place your skewers in them. Clean up any excess as best you can, any remaining should dry clear.
Once the glue is dry you're ready for painting or staining if you want to.
Here is a picture of it completed before painting.
Helpful tip: 1/2" vinyl tubing, cut in 1/4'' intervals then split open can be slid over bobbins to keep thread in place like this: