I just bought some spools from Matter hackers that have a 30mm center hole. So I've designed an adapter that slides on the original wheels. This adapter is built in 2 pieces so you can print different center piece that will match your spool holes.

You need to print the base and the axle.

To print the base you need supports. I've printed mine rotated (STL included) so the supports are easier to remove. You just have to skrew the two pieces and slide onto your original wheels.

I've included the Inventor files, if you want to design a different spool diameter axle. If you don't have access to inventor, leave a message and I will upload the diameter that will fit your needs.

Notes:

• The matter hackers spools are relatively narrow, So I've added a large cartboard disk to avoid that the filament falls down.
• I've moved my wheels on top of the 3dTouch using the coder holes for the bolt. It the best solution i found to avoid fimalent snapping in the plastic tubes.