Printing: HTPLA like PLA at can print at 200C or less, though exceptional mechanical results were achieved printing up to 250C or more for nearly twice the layer strength compared to 230C in our tests. Adjust layer fan and build rate for surface quality. Though a heated bed is not required, larger, more solid parts can benefit from bed temps up to 70C. Standard build surface preparation like blue tape or glue stick work best along with slow (10-20 mm/s) and hot (220C+) 1st layer with enough gap not to restrict material extrusion.
Heat treating: PLA and HTPLA as printed, though both adequate performers in an office environment, have poor temperature stability, loosing significant stiffness at temperatures not much above 50C. Different than standard PLA, HTPLA is designed to survive heat treating for higher temperature stability in a no/minimal load condition to near melting. That's an astonishing 3x+ improvement in thermal stability compared to standard PLA after a quick bake in the oven after printing. In as little as 5-10 minutes for small, thin parts and as much a few hours for massive parts, HTPLA v3 parts crystallize in an oven at 110C +/- 10C (200-250F) to become more stiff. Depending on part geometry, setup, and technique, parts can deform and shrink. Best results are with flat and/or supported parts with 100% infill. In this instance we experienced x/y shrinkage of only 0.5% and negligible z change. Be sure to avoid hot spots (non-radiating surfaces and no glowing coils) in the oven used for baking and experiment before baking a prized part. Heat treating is an art, but the resulting improved thermal performance, if needed, is well-worth experimenting to learn more. You'll be blown away by just how improved the thermal stability of your HTPLA v3 parts will be!
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