Ender 3 - Rail mounted Filament Spool Holder

thingiverse

Updated: To assemble, print one object file four times. Combine with six hundred eight skate bearings and two M5 screws fitted with T-nuts. Printed the original file but encountered issues - the pegs became deformed, making it harder to fit the bearings. Also, I found that two screws per side were excessive, requiring too much fiddling with T-nuts. So, I simplified the model by converting it to a single M5 screw and T-nut for each side. I discovered that printing the object 'on its back' improved overall print quality, especially when fitting bearings onto the pegs, which snapped in place nicely, and the single screw hole lined up perfectly. Unfortunately, the screws provided with the original spool holder were too short to reach far enough into the rail for T-nuts to catch, so I replaced them with longer screws I already had. Although they didn't fit the screw head holes, they were still long enough. I plan to use this setup with a direct drive system on my Ender 3, which will make feeding easier.