If I would need a strong part I would try ppmax of polymaker. It can go up to 110C and has a matte color.
For infill strong part, use infill Infill overlap of at least 20-25, to make the infill and perimeters bond strong enough. Also use something like 60-80% infill using honeycomb infill. Also increase the perimeters to at least 6-8.
Nylon of ultimaker, at least the ones I tested, are way too flexible and they have a very low temperature resistance (bad if you plan to test the part vs friction), also is useless as a part to postprocess unless you just want to dye it.
I use platec/greentec, I don't know how strong actually is ppmax of polymaker, but all the info seems to show is very nice. I think @amedee tested it.
Platec/greentec also resists 110C, is very easy to sand and paint and is a bit more flexible than pla, but also is very hard to break. And has the advantage of being 100% biodegradable.
The orientation of the part in the printer matters. You can probably predict where forces will be in your part. Take care that these are not in Z-direction, as cross-layer direction is the weakest.
Weight matters. The heavier you can print an onbject, the better. The relation between weight and strength is non-linear:10% less material makes your part 30% less strong.
But most of all: choose the right material. PLA is stiff, but brittle. Abs is tougher, and maybe Nylon is a good choice. Ultimaker Nylon prints very well, and is really tough, but it might be too flexible for your application.
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