Quite happy with my latest print, it is a 150mm long section of 80x80 aluminium profile, with some threaded t-nuts, no post-processing what so ever, the screws just threaded straight in without need to use any excessive force in the nuts, the profile is straight off the printer.
Printed in @ColorFabb1 XT-CF20 on a @Ultimaker 2+, i just love the surface finish i can get with that filament! 
how much infill?
XT-CF20 is beautiful and the most dimensionally stable filament I’ve ever used. I have to post my results with it when I have the ability to take a decent picture.
@denix this one was printed with 30% tetrahedral infill.
@Adam_Steinmark Yes, the surface finish and dimensions are superb with CF20, it also one of the best filaments to sand, it gives a amazing finish with just some light sanding and you can also burnish it to even better finish with a smooth piece of metal.
Tetrahedral? I don’t mean to sidetrack your post but wouldn’t that lead to a weaker part since there is less contact between layers of infill?
That’s a show piece for sure! Nice work!
Brook
So sexy
Beautiful print! I bet the carbon fiber has something to do with the dimensional stability. Do you use a special nozzle material?
@Adam_Steinmark it could lead to a weaker part in compression, but it should also lead to a more isotropic part since the contact between the shell and infill is more evenly spread out over the surface. Honestly i have not done any tests on this yet, i just like the idea of a nice looking and efficient 3D infill 
@Jeff_Parish The carbon fiber probably reduces shrinkage and warping, and adds to the dimensional stability. And yes, i am using The Olsson Ruby (http://olssonruby.com/) nozzle.
http://olssonruby.com/
Yep, exactly right, carbon fiber has a lower coefficient of thermal expansion than plastic, so it stabilizes the material as it cools. Less warping and more precise dimensions.
The CTE of carbon fiber is usually negative so that’s super helpful for this and molding over male molds/mandrels.
niceness!
Part 2 on its way
(40x40mm profile)
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I was never able to get good layer adhesion with this filament. What are the printing parameters you were using? (Temperatures, speed, parts fan speed?). Very nice looking print. Were you able to do functional tests?
@Jeno_Bozoki With XT-CF20 i usually print at somewhere between 30 and 50mm/s, with 260C extrusion temp, 70C bed and no parts fan, this way i get pretty good layer adhesion.
One thing i have realized is that it does not like sudden pressure changes (at least not at my printer), so i keep the infill speed close to the shell speed.
I have not done functional tests on this print.
That is a badass looking print ! wow
And here the 80x80mm profile is combined with a 40x40mm profile, printed angle connector and some printed t-nuts.
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@Erik_Cederberg Looks amazing, if you did not say they were 3D printed…
