Can anybody tell me the best infill and perimeter settings,etc. for printing some i3 parts?
There’s no reason to ever really do infill over 40%, I did all my parts at 20% and really anything should work. I always do 1 perimeter, but some people swear by 2, etc. Honestly, doesn’t matter much.
I believe the layer height is simply calculated in the .scad files, due to bridges. Open up the configuration.scad, make sure it’s generating your parts to match your layer height, and you should be fine.
I print mine at 100%, because I’m crazy like that. I have had a number of parts fail from stress and overheating motors. If you have decent motors and dont plan playing your belts like a banjo, you’ll be fine.
I also completely redesigned the high stress parts on my printer to be extra stiff and reliable.
@ThantiK depending on your nozzle size, one shell might not be thick enough to distribute loads evenly.
Depending on how much strain my parts see, I use anywhere between a 0.5mm shell with 10% infill and a 2mm shell with 30% infill. Top and bottom solid layers are just another part of the shell, so I adjust them accordingly.
Although I’m normally prone to infill at less than 50%, the parts I’m currently printing for the Tantus prototype are generally 50-100% infill with 1.1mm skin as they are either taking a press fit bearing, roller bearing or clamping a shaft, in all cases they have to accept some degree of mechanical force beyond a few nuts and screws. In my experience, its best to err on the side of caution, the plastic isn’t exactly expensive and an extra 20% infill won’t extend your total print time by too much. I suspect both @Thomas_Sanladerer and @ThantiK are using very well calibrated machines and as such are able to have confidence in their prints even at low wall thicknesses and infill levels.