I did a couple of tests with the 0.6mm Diamondback nozzle, here are the results…
I know only two datapoints are not the greatest, but all I really wanted to know was if there was an increase or decrease in strength with printing at 260C (like I used to with a hardened steel nozzles) and at 245C, which is where the Diamondback nozzles print the nicest… Thankfully, there was not (in fact the vertical coupons were not quite as strong at 260C), and the 260C prints were not as pretty, with a “twig” or two sticking up pointing towards the other coupon (they were printed side by side)… These were easy to cut off, but why print that hot if you don’t need to, right?..
My conclusion is that the Diamondback nozzles do need to print at a lower temperature with CF-PETG to prevent stringing, and using 100% fan instead of 30% really improves the vertical (Z) layer-to-layer bonding… In fact, when printing at a layer height of 0.3mm and a line width of 0.9mm (a 3:1 ratio) the “Z” coupons had a jagged break, and you could not even see the layer lines… They were 80% as strong as the horizontal (X) coupons printed at the same time…
I am REALLY impressed with the combination of the Diamondback nozzles and the 15% carbon filled CF-PETG from Matter3D Inc. in Victoria, on Vancouver Island, BC… At $65 CAD per kg. it is one of the least expensive CF-PETG’s around, and if you want a cheaper one, they do a 10% which is nearly as good, for just $40/kg… and those are the regular prices, I got a roll of the 15% on their “Black Friday” sale for just $43 (all prices in CAD, which is currently at $0.69 USD)… If you are going to get a Diamondback nozzle for printing CF filled materials, consider just buying the 0.6mm, and forget the 0.4mm… You can print beautiful prints from 0.2-0.3+mm layer thickness, and line widths from 0.6-1.0 mm… That should cover all of your CF printing needs, IMO…
Bob