The spacer fits the scott addict rc models from 2024 when you want to pair the deda elementi stems to you bike with full dcr integration.
I printed in PTCG CF, and anything less is not recommendable. preferably nylons or similar should be used to ensure enough strength at the headset. 

I printed on a 0.2 nozzle to get the quality high enough. 

I made it to work with the original rubber seal that comes with the rc scott stem. without the rubber seal. it will not shield the headset bearings from ingress. 

*use at own risk. 

*I even uploaded a picture of alle the trial and error to hit the offset scott has made on their steering column.