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Will a glued acrylic structure hold for a 3d printer ?

Hi, 
I'm designing a delta style 3d printer from scratch while trying to use only laser cut acrylic sheets and aluminium extrusions. The entire design is based on the T Bolt construction idea. But there are a few parts that simply need to be glued together. I'm trying to avoid using such joints in load bearing areas but there are a few areas where this is becoming difficult such as the carriage. I'd like to know if i can safely glue the laser cut parts together with out the entire thing falling apart and if yes what kind of glue should I look for?

Blckthng

blckthng (author) 3 years ago

I'm planning on using 6mm thick acrylic for the prototype, the final can very well use water jetted aluminium. The problem with laser cut edges is that they are at a slight angle to the normal, will using an acrylic in acetone paste help fill in the potential gaps?

Burf3 years ago

Acrylic plastic is not generally recommended for structural purposes though there are some exceptions in specific applications. Acrylic's structural properties are TTL&UV (Time, Temperature, Load and Ultraviolet) sensitive and can change adversely. Inspection for deflection and cracks should be frequent and thorough.

rickharris Burf3 years ago

+1

It is also quite expensive in thick section. I would go for aluminium throughout.

BUT if you must than use a propriety acrylic glue. they are solvents that melt and fuse the acrylic together. You can get thick and water thin, in general the water thin is more versatile. The parts MUST be very close fitting as the glue isn't a gap filler. Put them together and run in the glue from a syringe. You can use a brush but that will mark the surrounding acrylic and looks unsightly unless you are very careful.

Look up Acrylic glue. It pretty much bonds the pieces together as if it where a single piece to start. But only if the joining edges and perfectly flat and fit perfectly. Most large fish tanks are made with glues acrylic sheets and they hold hundreds of gallons of water.