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The connecting piece of the recliner at home broke and came apart in the middle, as shown in Figure 3. As a result, when lying down to sleep, it would just flip over and not hold in place at all. I drew a new one that fits perfectly, and I just removed the metal ring in the front. It doesn't seem to be very useful. Anyone who needs it can modify it themselves. I used the default parameters and a K2Pro. I recommend printing two of them, otherwise they might not be symmetrical on either side. Printing them vertically provides higher strength, but you'll