Prusa MK4S: Unbeatable open-frame 3D printer. Fast & Top-Quality prints. Now 20% OFF (assembled) and 10% OFF (kit) and with shipping for $69.99 in the USA and FREE shipping within Europe (assembled). Easy to set up and run, with top-class reliability and safety features, the MK4S delivers the highest quality 3D prints faster than ever. Designed and built in the EU. The Prusa CORE One kit is now available. Check out our top-notch assembly manuals.