@cope413 Wrong paper - and even what you circle shows anisotropy As you like stratsys here are 2 links there https://uzcwd39yh8l1ul8th1szmq3x-wpengine.netdna-ssl.com/wp-content/uploads/pdf/Fathom_Spec_Sheet_Nylon_12.pdf https://uzcwd39yh8l1ul8th1szmq3x-wpengine.netdna-ssl.com/wp-content/uploads/pdf/Spec_Sheet_Nylon_12CF_EN_SSYS_Fathom.pdf Which shows the CF variety stronger in the one direction and considerably weaker in the other (ZX azxis) and considerably weaker on the impact. Which means you might get a stronger part in one direction but if you want one in all directions you migth be better off with the unfilled version. And if impact is a consideration the unfilled is definitely better OTOH if you look for stiffness (less bending when you put weight on it ) the CF is definitely better. So that holds water with the fragments adding abrasion resistence and stiffness and taking away from the overall (on every axis) strength. Does not make one better than the other just more useful then the other for a particular task. Putting aside the greater difficulty in printing CF filled assumining you have mastered that it still comes down to from what you want from a part like with any material thats why tires are made from rubber and windshields from glass and not the other way around. What I take exception to is to always push the most expensive most profit $$$ generating except what might be the most useful for a part. I print almost nothing in PLA cause its the wrong material for what I print Its tensile strength is probably the strongest of all (except some fancy engineering grade materials) but its super brittle (no impact resistance) and grinds itself up when used as gears and not even getting started on the heat resistance which is extremely low. But if I print a chess set or a dice tower which from time to titme I do I use it and If I print a tire I use TPU Like here https://www.chiefdelphi.com/uploads/default/original/3X/d/f/df23ce1d914c8351a4ee66cefefde5eedad8a510.gif The Tire is TPU the rim and gears are Taulman 910 and the holder is ABS (that gets wrapped into some 17 oz woven roving and 10 oz glass And I could show you an omni wheel from PETG and TPU as its the right material in the price range we had to work with tough enough and cheaper than Nylon. Here is a look at the inside https://www.chiefdelphi.com/uploads/default/original/3X/e/1/e13c9a76038521ea4459663ed1f32ea2f808af87.jpeg And this prototype is printed in HIPS https://www.chiefdelphi.com/uploads/default/original/3X/0/0/006c7575563604a4bea24ba92c0328a11db43c3a.jpeg as we get it for <$10/kg and it hurts less when you make a part that does not fit or work as desired - you are looking at over 4kg of HIPS. Now I tried a good number of your filaments and had no luck with the MH stuff for what we print and whenever I asked it was obviously something I must have done wrong so IDK you except from here but that Matterhacker label does not help me to have much confidence in you. And yet I/we print over 100kg worht of stuff successfully a year. I myself cranked out 4400 prusa faceshields last year mostly from HIPS and Zyltech PETG and ABS (if someone drops something off at your house to turn it into a faceshield you do whatever it is I would have printed weed whacker line at that point). As for ABS - I wasted 2 kg of MH ABS cause it split and warped yet here are 1.5 kg of ABS in one part (Zyltech) https://www.chiefdelphi.com/uploads/default/original/3X/c/1/c12a5114693164c2f1d913f64317e420c0634d50.jpeg took a little over 20 hours to print sliced with Prusa slicer printed with a volcano hotend on a Chiron (thats a 400x400 build plate) with a .8 nozzle .4 layer height .88 outside perimeter width 1.5mm inside perimeter width I think somewhere between 8 or 12 perimeters I forgot. If you want I give you the STL and you can try printing it in MH build ABS.