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Re: 3d printed stem spacers??? A couple of thoughts.

This paper is comparing short fiber reinforced polymers, not the materials you have proposed using, there is some discussion in other papers about whether or not 3d printing can actually help you gain directional strength because of the ability to control fiber orientation.

The caution i am expressing regarding FDM vs. production quality injection molded parts is also what you will hear if you contact production experts at places like Xometry that work on rapid prototyping with all of these technologies and is what most engineers who work with these technologies will tell you. For example, when HP says "MJF produces a part with anisotropic differences that vary between 95% and 90% of an injection molded part" they are, like these papers, assuming the same formulation of material. Unfortunately even for something like "standard" PA12 there are fairly significant differences between the materials themselves that would be used for different production processes including FDM, SLS, MFJ and injection molding. You can pull the data sheets from Stratasys, HP, etc and see for yourself.

Of course this stuff continues to change and today we see 3d printed parts being used for small production parts and on race bikes at highest levels. That would have not been the case only a few years ago.

Obviously the risk is yours to take and it very well may work fine, but this project is pushing the limits of both the materials and the design envelope for most carbon bikes in multiple ways. Good luck!
September 01, 2023, 11:38:31 AM 		1
Re: Airwolf YFR068 - 2023 Gravel Frame Built - looks AMAZING - test ride was good as well. Light and fast. Will send pics after longer ride.
September 05, 2023, 11:52:38 AM 		1