Ce filament PLA 3D850 a une très basse contraction thermique, il est idéal pour imprimer des pièces avec une haute résolution et de plus avec quelques meilleures propriétés mécaniques et thermiques qu'un PLA normal. (Le PLA 3D850 les supporte même 85ºC, en face d'eux 55ºC d'un PLA normal).

De plus il brille par sa vitesse élevée de cristallisation, grâce à cela il est possible d'augmenter plus de 50 % la vitesse de l'impression à l'égard d'autres matériels.

3D850 - This grade exhibits faster crystallization rates and is able to develop improved heat-resistance in 3D printed parts. This low color resin grade demonstrates the best performance in formulated systems designed to enhance toughness or heat-resistance.
3D870 - Engineered to deliver improved heat resistance and high impact strength to 3D printed parts, this formulated grade achieves thermal and mechanical properties similar to ABS while offering an alternative to styrenic-based materials.

Doesn't matter what direction the z axis goes, usually it will go up and down during a print unless you aren't using a bed mesh or z hop. Just because its in a printer assembly manual doesn't mean its right. For example the common 130hz at 150mm of free belt length is the norm for belt tightening procedure, in reality its undertightened according to the belts manual. The drag chains used in voron are way to small, the drag chain manuals basically say that all wire must be arranged next to each other, not so densely packed as they are. Meanwell uhp manual ask for the psu to be installed on a large aluminium plate, size depends on psu size, with thermal compound as the uhp series of psus are only so small because they rely on external heatsinks to stay cool enough under continuous high loads. Meanwhile people bolt printed clips onto them and install them onto din rails. Not to mention the use of smooth idlers or bearing stacks on the teethed side of the belts. As you can see, the 3dp community is excellent at ignoring installation manuals from the companies making the stuff