3D printing is good for many bits of an R/C plane, but not a 450mm or longer spar. What suggestions does the group have for bonding a 3D printed rib to plywood? Something besides CA glue? Do I put small grooves in the 3D printed to hold extra ridges of glue? Thanks for your suggestions!
Epoxy glue?
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Epoxy would probably be best, you can use the liquid resin to attach resin pieces together, but that probably wouldn’t bond with plywood.
Use CA and an accelerator. I really like this stuff: https://www.amazon.com/Bob-Smith-Industries-BSI-151H-Accelerator/dp/B0166FFCCS/ref=pd_nav_hcs_bia_t_2?_encoding=UTF8&psc=1&refRID=B6SFT2RDM54GREJ4A2KT
It cures in seconds, and makes CA more like an acrylic additive than a glue. I use about 2 bottles a month.
Have you considered a mechanical joint? if you print with the layers aligned correctly and use techniques similar to traditional wood joining methods I would expect it to hold quite well.