I wanted to design a spool holder that I could operate with one hand and was different. This is that!
This works with Spools with ø44 mm I.D.s and up.The wheels turn on the inside of the spool.The elephant ears guide the spool on its smooth edge and clicks into place.It adjusts for wider spools.
I drilled and screwed the dove tail mount to the acrylic frame of my Prusa i3 (M4 x 20 pan heads). I will work on another mount later.
For axles on the wheels, I used a wooden skewer from the dollar store, and on the other side I used a piece of a coat hanger, which I cut with Pliers. You can also use 2 round toothpicks but you will need to secure them in place
Clean and sand Spool holder so dovetail can be inserted cleanly into mount. Make sure axles fit easily thru wheels. You may have to scale them up depending on your printer.
Cut axles to length , using skewers. toothpicks, coat hanger wire, something approx 2.7mm. for the axles.Navigate axles into holder and thru wheels.
Slide the assembled holder on the dovetailed mount.
Put Spool on mount.
.Insert and slide in Elepha-adjuster to maintain a small amount of clearance to your spool.
I made this using SketchUp and Blender and more imagination than skill.This is version 6.