This is a brilliant idea as it allows you to use any spool of filament you like. I have a dual extruder 3D printer so I bought two sets. I have found that the best way to use them is to take a piece of cardboard and draw different positions for different coils and then attach them with double sided tape so I can easily match them to the coil(s). . I use. You need to make sure the blocks are perfectly parallel to each other, and then gently tap the spool so that it is centered on the bearings. I would say it could be improved if there was no space in it. There is a latch 22 on either side of the bearings as nobody wants them rubbing against the sides of the device, but the slight adjustment I suggest would be a huge improvement (an already great item). HELLO! I would buy a few more if they made this change but I'm still perfectly happy with them the way they are!
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