Soo like an idiot I was tightening my belts on my X1C and I over tightened one of the 4 screws that hold the tension pulley in place. It now just spins freely and won’t tighten down. I looked on their website for a replacement part, but all they have is just the pulley mechanism itself not what the screw screws into. Does anyone know a fix for this? Should I just drill and tap a new threaded hole one size up? Any help would be greatly appreciated.
You could consider loctite…might do the trick…at least until you find another solution
The threaded section is a heat set insert. You may be able to reheat the insert with a soldering iron to lock it back in place. Alternatively you may be able to superglue the insert and stop it from rotating. Just be careful as getting glue on the threads will cause issues. Might be wise to chase the threads with a tap after gluing.
Here is the wiki link with several more pictures of the assembly at various stages.
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Awesome! I was not aware of that. I got a heat insert kit. I will just remove the old and put in a new one. Thank you very much
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If it were only that easy. What you will likely find is that once you heat up the old insert, you will have deformed the plastic and there will not be enough material to gain enough purchase on the new insert. Who knows, you may get lucky but not as a long term solution. More likely the case, is that you will quickly make matters worse.
However, before you make that effort. I would first practice on a similar piece of plastic. Try to press in an insert and then practice taking it out. Once you’ve proven that you have the confidence and practiced skill, try it one the real deal.
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Does anyone know what this material is? I touched it with my finger It doesn’t feel like ABS or ASA. It feels more like PETG in that it is slippery. It might even be a Nylon-CF material but I can’t tell.
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Alternate idea–I would only do this if I were desperate and out of options.
Your experience may be different but I would avoid using any acrylic glue, like crazy glue, or acrylic cement, that material is likely too brittle and will more likely crack. Instead, use a two-part epoxy, which undergoes a chemical reaction to create a new material.
I am not a big fan of JB Weld epoxy. It makes a lot of claims that simply aren’t true. However, in this one area where I’ve found it useful is in “moderate” thread repair. Quiksteel and others like it are also a possibility but I don’t have experience with those. I don’t consider this use-case moderate because of the stress on the thread, but if you’re stuck for a solution, what follows might work for reinforcing stripped threads, depending on the level of damage. I have used this method on stripped screws while repairing PC cases. Again, that is a lightweight challenge and this is not but it was very effective. You will have to experiment to verify it will work before you attempt it on the live machine.
Again, practice this before using it for real. This is similar to the exercise I mentioned above and you definitely want to make mistakes on something other than your printer.
- Print out a test section of similar thickness and size, using a harder, high-temp filament like PETG, ABS, or PC for practice.
- Install the heat insert you plan to use.
- Deliberately strip a screw inside the heat insert to simulate damage, as in the previous example.
- Use JB Weld to plug the stripped hole, leaving a spacer in the center before it cures. Use something like a toothpick or a tube from an air can nozzle in the center to give the drill bit a starting point if you want an easier time drilling.
- After JB Weld cures (don’t rush it—wait 48 hours), drill out just enough excess material—not the metal—to allow for a tap to enter the stripped hole.
- Tap the hole with the appropriate tap size (M3? M2?).
- Test the thread with a new screw and try to strip the threads again. Repeat this exercise until you’re comfortable with the “feel” of the torque on the screw before attempting it on the printer. You will be surprised what your muscle can tell you about torque if you practice.
Here are the tools you will need if not in already in your toolbox.
https://www.amazon.com/s?k=metric+tap+set+m2-m6
https://www.amazon.com/s?k=QuikSteel
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Option #3
Swallow your pride and plea to Bambu that you overestimated your technical ability and that this is a learning experience and could they pretty please send you a replacement part. That’s probably the best strategy. 
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Did you ever get this fixed? I have the same issue.
Yes, and no. If your printer is still under warranty, you can contact them and they will replace it. However, my printer is no longer under warranty and unfortunately they don’t sell the part that I need to fix it so they pretty much said there’s nothing they can do And that, maybe in the future, they will start selling that part. Anyway, I ended up just heating up the brass insert with a soldering iron so I was able to remove it and then I put a bunch of epoxy around it and put it back in and let it harden. So far it has held and is working just fine