Yeah, when the temp gets warm, PLA will warp without warning. There are some companies making a type of high-temp PLA, but it costs way more than regular PLA and ABS, so I continue to use ABS. My new printer will be able to do nylon, which will be really strong, not that ABS is weak; we did destructive testing trying to break some ABS parts made for RC naval combat ships, even shooting them at about 1' range with a BB cannon repeatedly. Really tough stuff.