Marques

@Dandiego, impressive work you are doing. To design things in fusion as complex as an aircraft is kind of daunting, isn´t it? I´m also in that road, but one thing that it stopping me is the postprocessing of the FDM prints, a pain in the ass. Anyway, I saw the other day a youtube video of a guy that used printing resin to soften a FDM printed helmet and the results were great. The idea is that this resin is quite fluid, so it´s easy to have it covering the printing lines without loosing details, and it cures with the sun. I´ve not tried it myself yet, but I thought that it was worth mentioning.

If it´s difficut to sand it´s most likely PLA. It´s not ideal for modelling, just because of that: it´s difficult to sand and easy to melt. Be careful, it may be that if you sand too hard or with a electric tool the surface may melt and warp. A possible plan B is to fill instead of sand (with a coarse primer, diluted putty or car industry putty) although then you may loose detail. But personally I think that this is the best approach in this case.