Modified Prusa-Mendel 3D Printer

grabcad

The enclosed build space features Lexan paneling with a hinged front door, while rubber corner pieces line all seams. The hot-end is an experimental, all-metal design made of 303 Stainless Steel. A modified extruder with an embedded hex nut pulls plastic filament through instead of pushing it with a hobbed bolt. An air duct focuses fan air onto the nozzle top, preventing heat from rising, and uses two fans - one blowing down into the duct, the other exhausting air sideways. M3 screws and nuts are used for most parts, fitting 5-40 or 6-32 screws and nuts as alternatives. Standard lm8uu bearings with m8 threaded rods, couplings, and 8mm shafts are utilized in the design. Remember not to breathe in plastic during operation. Printable STL layouts simplify printing and reduce second operations; approximately 3.5lbs of plastic (with 100% infill) is needed for completion. Share your experience if you decide to print this modified Prusa-Mendel printer.