After some more research I found people suggesting Weld-On #16, an acrylic adhesive that will actually melt PLA. A little of this applied to the parts, they said, and you can solvent weld PLA just ...
The adhesive used in bandages is commonly an acrylic polymer. What is a polymer? Polymers are very big molecules made up of many smaller molecules chemically attached together in a repeating pattern.
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