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Most of these are ABS which is easily re-welded with Acetone. I use a modelling paint brush and keep re-wetting till it’s perfect. Or I use hot melt weld with an old soldering iron tip. Works well.
Have done both methods on laptop PSUs. Adheres as good as new. Indeed most simple cases are glued together at a few points (there is usually a small inner lip). You can usually locate these strike with flat blade screwdriver to break that glue point. They usually come apart easily. Or can be “hot knife” cut apart
Acetone mixed with styrene can make a glue mix that adheres with many plastics. But not PVC or PLA.
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