This is my take on Joel's Filament Holder Challenge. This holder is ment for Bearings and metal rods. You simply put the bearing into the holder, glue on the Sides to hold the bearing in, and find a metal rod to fit the inner diameter of the bearing. I made this holder in onshape, and have dsined it to fit bearings with an outer dimeter of 1-2 inches. 

     Here is a link to my onshape document so you can make the douter dimeter fit the bearing of your chaoice if you choose this as your winner : https://cad.onshape.com/documents/53c32d37f0a8f4c00584cb52/w/32c819734a1c074178e6b9b6/e/4126cf7322a1b93ebe5fe98b

          You can contact me @ druppin@yahoo.com Should you have any further questions about my design or are interested in editing the design to fit your bearing.

Cheers,

   Dan R