If the carriage is made of pla. You will experience warping period. A carriage made of pla needs active cooling to even come close to surviving. I ended up reinforcing my carriage with aluminum plate to keep it straight, then I printed an ABS version and still used aluminum plate to reinforce it. My jhead was running between 210c - 230c. The heat creep warped the pla part in less than an hour. I do not actively cool my j-head. Check out my blog if you want to see how its been reinforced.
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