Siraya Tech Fibreheart PET-CF 3D Filament - Carbon Fiber Reinforced, High Strength & Rigidity, Easy Print, Dimensionally Stable, Aluminum Foil Sealed Bag - for Strong and Precise Parts (Black, 1kg)

I printed a mechanical piece that I had printed with PLA Professional. Using that filament, everything fit and worked properly. I found this needed 290 nozzle and 90 bed in a Creality soft-sided enclosure on an Aritllery X4 Plus S1 using it's PEI sheet with glue stick. I printed on the Y axis. At 280/80 one side of the base layer pulled loose when the oblong item was printed aligned on the X axis. I printed a .2mm layer height at 100mm/s with fans 20-60%, 2mm retraction @ 40mm/s and 100% infill. See below for print setting conflicts. I used this filament right out of the bag, as it says on the site not to dry it unless you have problems.Once the part printed, I was able to get the supports out relatively easily, and the surface while not smooth was decent. This portion was a marked improvement over the Overture Easy Nylon I tried before.I then removed an internal metal support from the same model in PLA plus and it would not fit into the same opening. I tried to push it into place and the front portion of the pocket cracked, turning the model into 3 pieces. This material is very brittle. A second larger metallic piece designed to be removable fit most of the way in, but jammed once seated. It easily pulls in and out of the PLA plus.I have deducted one star for various reasons-1. The print settings vary between what is on the bag (I got old stock marked PAHT) and what is on the website.2. The shrinkage made my item unusable. I'll have to experiment to get the enlargement right in Cura. UPDATE- can't be done, see below.If you go by the label on the bag, here are the print settings:Nozzle 280-300Bed 80-100Speed 30-220Fan 0-80On the spool, it saysNozzle 280-300 (same)Bed 80-100 (same)Speed 30-200 (slightly lower)Fan 0-80 (same)On their website (product page), it says this:Nozzle 260-280 (lower)Bed 70-80 (lower)Speed 30-120 (lower)Fan 20-60 (lower)On their website's user guide, it says this:Nozzle Temperature 280-300 (same as bag)Bed 70-80 (lower than bag, same as product page)Speed 30-120 (same as product page)Fan 20-60 (same as product page)UPDATE- Reduced to 2 stars. This material is just not suited for precision printing. I adjusted my model in Cura after measuring the failed piece and one that printed OK as-is in PLA Professional. I added 7% to X and 2% to Y and Z. I also reduced layer height to .16. While the support fit in the pocket this time, the locking pin that holds it in place would not go all the way through. It started on one side, and it ended up cracking in the exact same spot as before when I tried to drive it into place as designed- something PLA Pro has no problem with. I also found there was too much slack for the other part that fit into the model. Seems like nice material, but just not suited for what I needed it for. You shouldn't have to spend so much time dialing in shrinkage for such an expensive filament when filaments that are about 1/3 the cost don't have this problem.UPDATE 2- The seller contacted me and advised the website setting were correct, then offered to refund my money. Revised up to 5 stars, that is how to correct a problem.

Awesome filament. My new go-to for functional prints even over PA-GF/CF. I’ve had zero stringing or clogging. Mechanical properties after printing are awesome. Very rigid but with enough flex to not be brittle. Printing has been a breeze with no warping or Shrinkage that I’ve observed at all. Dimensionally accurate with a good finish. Build plate adhesion is perfect on my smooth PEI plate with some CSR dream adhesive. Releases from the plate wonderfully but stays adhered through the print.The 1kg roll is so much more convenient than the .5kg roll that some others use. 10/10 will absolutely buy again

loooooves to make long term friends with your printbed unless you put some gluestick or release material on there.Print slow for more stregnth. 50% of the bambu PET-CF profile is a good starting point for speed. Crazy strong and stiff. Does shatter when it breaks. Make sure it's super dry before printing. I live in a very dry desert and I still have to toss it in a dryer every couple weeks if it's sitting between prints. I've used this for 2.5 and 3" drone frames

I had to amend this from a 3 to a 1. This stuff is garbage. It is so hard to get to stick to the plate. I came home to find a 3 hour print just globbed up all in my extruder. If you want good nylon, QIDI makes good stuff, especially if it is the carbon fiber reinforced stuff. It is like $100 a roll, but it's 50 times better than this garbage. I am tempted to throw this roll out. The only reason I used it today is I wanted a darker black for gun grips I am printing, but I am just going to go with the same stuff I have been printing the rest of the gun with, because that stuff sticks and prints great.It's hard to get to stick to a plate, even with glue. You have to have your bed really hot. It does print small things pretty accurately though, which I can't say about most other strong filaments. It has a good flex to it. It has a nice shiny finish. Layer adhesion is not great, but I am used to working with carbon fiber reinforced filaments. The gear in the picture of this product... I would not trust this filament to make a strong functional part like a gear. I would go carbon fiber reinforced PA12 or polycarbonate. This stuff is alright. I don't regret getting it, but I am sure there would have been something better for the same price. I am loving Xpolyer CF Polycarbonate. I recommend that over this stuff anyday.

Okay, this stuff is amazing! If you can get it to print! Its so abrasive it rubbed a groove into my dryer printing straight from it.It clogs like MF, I used a .5 nozzle never have this issue with other composite filaments. Even with a Galileo 2, rapido fiber, .5 and .6 nozzle, and temps at 320, it clogged 3 nozzles.Adhesion is amazing this stuff sounds like metal when you can get a print from it. It wasn't very wet out of the box, but drying did help a little bit. Make sure you put down glue stick as and interface layer! This stuff is crazy!The color is a deep shiny black that looks really cool on my stealthburner. I like painting higher temp filaments and needed something better than ASA for my rapido.It works really well and had withstood printing itself. I'll use it for more function prints or high temp projects!

This filament is extremely strong, probably the strongest I’ve come across to date. It has a separate core with carbon fiber making the outside of your print smoother. With this being said, it should be noted that this stuff will NOT run well in a high flow nozzle that uses separate flow ducts such as with a CHT nozzle. It will extrude however your parts will have a very rough finish. Use a standard flow hardened nozzle, print slow and hot and you should be good. I run this at 300c, it will run on less however layer adhesion will decrease which I assume most buying this filament will not want.