Instead of plastic, this printer uses biocompatible titanium powder, which does not trigger rejection.
这台打印机并没有使用塑料，而是使用不会引发排斥反应的钛粉。
英语百科
Titanium powder
Titanium powder metallurgy (P/M) offers the possibility of creating net shape or near net shape parts without the material loss and cost associated with having to machine intricate components from wrought billet. Powders can be produced by the blended elemental technique or by pre-alloying and then consolidated by metal injection moulding, hot isostatic pressing, direct powder rolling or laser engineered net shaping.