Summary with this project i'll try to print most non printable reprap parts Instructions the structure will be like mendelmax http://mendelmax.com/tikiwiki/tiki-index.php?page=MendelMax http://www.kickstarter.com/projects/openrail/openrail-open-source-linear-bearing-system https://docs.google.com/spreadsheet/ccc?key=0Ao-fptzJAVfGdDdnd3htckhZUVdWUTdvRnJQUEJrMUE&hl=en_US#gid=0 the weight of single part 2x2x11cm is 20g with 3 perimeters and 80% infill and take about a our to complete (75mm/s) with this settings the total weight of all plastic extrusion for mendelmax are 900g (about 17€) for make a complete bar we need 3 pieces (60g of PLA) and 8 pins for joints according to this https://docs.google.com/spreadsheet/ccc?key=0Ao-fptzJAVfGdDdnd3htckhZUVdWUTdvRnJQUEJrMUE&hl=en_US#gid=0 i have made different type of extrusions, 4x 105mm = 420mm extrusion and so on :)