2 sizes: 4mm OD and for stock for MakerBot PTFE tube (~6.25mm OD)
We recently moved and don't have all of our shelving installed. One printer and spool holder are kind of just sitting on the floor so we are using a guide tube. A binder clip caused the tube to slide around, so we whipped this up to fix the problem.
Careful with the clip as the thinness and orientation cause it to be pretty weak.
Here's the compatible binder clip (1.25"): https://www.amazon.com/dp/B074XTSCWK/ref=psdc_705361011_t1_B07D1LGWZ8?th=1
Not sure how useful this will be for others, but figured we'd share it.
3D-Fuel Workday PLA
Should be self explanatory, but here's how everything fits together.