About this 3D model
Here is a very simple design of a filament holder which isn't big and bulk and take's 30 mins to make the 2 you need. You can even print this with very little infill, I only used 10%. I designed this after needing one and all I could find where one's which looked over complicated for what I needed it to do so I designed this little one which works a treat and should work with all size filament spools. I have included a couple of feet which you can make out of ninja flex which work great if your printer is pulling the filament straight across instead of pulling the filament up. Here is a video of it working :