Spool Holder for Ender 3
Description
Yet another spindle holder. Why? I have a number of old Taulman spools with only a 19mm hole, so they don't fit either the stock tube or any of the other mods to fit the stock bracket. Like so many others, I found that the friction on that stock tube introduced quite a lot of friction until a threshold was reached - then the spool would jump forward a tad. Unacceptable. One of my pix shows the make-shift taulman hanger - an extendable dowel that worked but is too ineligant for even me. So I borrowed some ideas from other similar designs, although I did design all from scratch, ultimately. I chose 1/4-20 SAE hardware, mainly because the local hardware store has more choices along that line. I should admit to a couple changes from what's shown for hardware: the bearings shown are a larger outer diameter than what I ended up using - but they're not included in the STLs. I also used different nuts than shown: for the outer one I used a nylocker; for the inner, I actually used two "jamb nuts" instead of one "normal" unit. Those jamb nuts are thinner, so perhaps using two regular ones would mean that a 6" bolt wouldn't quite reach? I guess one could use a 6.5" bolt if that's so. One of the trickiest things was finding washers small enough to isolate the bolt head and those jamb nuts from the bearing seal wall. It needed to grip the inner race securely without making any contact with the non-moving side-walls of the bearings. Those inner races were so thin that it took some trial-and-error before I found tiny little lockwashers that worked. At one point I printed my own little nylon washers, but when I found what I wanted in the bigger hardware store not so close to home, I jumped at that upgrade! It turns out that there is just the right amount of resistance so that I don't expect problems with the much-discussed free-wheeling tangle-fest. I might mention that the large, rectangular "nut" is theoretically an option: one of the original nuts that came with the stock unit should suffice. (those threads are 30mm x 1.5 pitch) If that's appealing, perhaps using both of the originals would be better (stronger). I was looking for more support for the bearing-carrier around the inner bearing - maybe unnecessary? Besides - I never liked that those plastic hex nuts are not held from turning by the side walls of the bracket. Mine at least solves THAT. I chose to use two types of filament: PETG (red in the pix) and Taulman's Alloy 910 (black). Again - perhaps overkill - but that's my story, and I'm stickin to it....
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