The tripod head was broken lengthwise. For the repair, I only replaced the head (in yellow). The rest of the parts could be reused. The tripod head is connected to the rest of the tripod by a 40 mm M6 screw. The screw was glued into the plastic and had to be broken out. The bubble level was also glued in place and had to be broken out as well.
For a good printing result, I recommend printing some supports around the hinge.
The clamp lock is fixed with a screw. The hole of this screw must be broken manually after printing. I only printed one layer, which can be broken through with a bit of force using a pointy object (i.e., screwdriver).
The author hasn't provided the model origin yet.