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I recently purchased PLA-X and Silk PLA filaments from HK, to test against my normally purchased PLA materials. I have to say I am very, very disappointed in both of the materials listed above. One job failed to even start properly, thought I might have done something wrong, so started again. Next job started fine, for about 1 hour, then it just went to pot. I have quite a bit of experience with 3-D printing and regret that I wasted money and time on trying the two types of filament mentioned above. Buyer BeWare!!! Neither of the materials is acceptable in my opinion.