Anti Tangle Clip on Spool Disc

I often had a problem where the filament would sometimes hop off the spool and create a nasty tangle. I would estimate that it happened on about 1 out of 5 spools. I saw solutions that basically require you to create a whole device that holds the spool from underneath, but I needed my spool holders to be wall mounted. 

I feel this is a good solution. It only uses about 50-60 grams of filament, and doesn't require any other parts. Just clamp it on a new spool, and then leave it on until it's done, or the filament is a couple inches below the outside of the spool, which is when the risk of a tangle is pretty much zero. 

By default, it holds a spool that is about 200mm in diameter. And the thickness of the side of the spool should be about 3mm. If you have a bigger or small spool, you should be able to just resize it on the xy axis of your slicer. If you have thicker or thinner spools, then just resize it on the z axis. As far as the thickness goes though, you may want to just make it so it can handle slightly thicker spools than the ones you use. For me, these dimensions seem to work for the 5 or so different brands I use. Also, you may want to confirm that this will work with your spool holder as far as clearance around the spool is concerned since all it really does is make the side of the spool about 60mm larger in diameter, which means you need about 30mm of clearance around it. 

Those are spring built in, too. So they grab onto the spool.

As far as printing it, it's a pretty easy print. It's print in place, but it has a clearance of about .5mm, so most printers should be able to handle it. You do need support on the overhangs at the end of the springy things. The only problem many will have is that it does need a larger printer bed(mine is 300mm). Otherwise, you can just use your slicer to split it up. Just don't split it up across the springs. 

After you print it, just slip on one side and then the other.