Dual Extrusion Motor Mount - Ender 3, CR-10, etc - NO HARDWARE REQUIRED!
thingiverse
Add an extruder to the left side without buying any extra hardware and making major modifications! I printed the original model, then installed it, only to realize I needed longer screws - which I didn't have on hand. So, I came up with a quick fix and beefed it up as well. You can see a side-by-side comparison in the photos. This extruder was printed in PETG and doesn't require any supports. Installation is straightforward: remove the top screw, replace it, then repeat the process with the bottom screw to avoid throwing anything out of whack. Note that there's a design flaw - you can't grab onto the nut when tightening it. However, I managed to get it tightened enough for now. In hindsight, I should have created nut-shaped holes, but it still works fine for now.
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