Searching for strength and light weight, those were the next filaments in the Zortrax.
Optimus PETG/Carbon( https://www.filament-abs.fr/produit/filaments-petg-carbone-au-metre/)
printed with the PETG settings, speed and extrusion -10%. I would say those are not critical and also the normal settings would be fine, however this was a good starting point. Retract and retract speed should both be increased, I am now up to 1,7mm and 40 speed. Print temp 240Â°.
Surface is excellent, one of the best I have ever seen, pretty smooth, no layers visible. Density of the printed object was calculated with 1,06, which matches the advertized value 1,05.
I printed a float segment with 1 shell, and the layer bonding turned out to be much weaker than the Zortrax PETG.
So this filament should be great for volume models who need stiffness, a perfect surface, and light weight.
Next was PETG+Kevlar from https://www.atome3d.com/products/petg-kevlar-jaune-nanovia-1-75mm-500g
Same settings as above, only temp increased to 260Â°. Also a very fine surface, no layers, however just not as smooth as the Optimus PETG. The one shell float segment was not as stiff as with carbon. Weight is lower - 11,4 gramms compared to 12,8 gramms of the Optimus - and the kevlar seems to mesh better with the PETG, layer bonding is considerably better than with carbon.
Left kevlar, right carbon, which already has a crack by just bending it gently: