Diagonal rod for Rostock
by Johann, published
Newer versions of the OpenSCAD source files will be published here: github.com/jcrocholl/rostock
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Â I calculate 232mm, im going to cut a rod of glass fibre and this is the number after compare in openscad and see some files of the rod. The key is 250mm between holes.
Did manage to find some m3x12 locally. The length was perfect for the universal joints. They are pan head philips though, but a small screw driver works.
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These rods printed very well in PLA with the following settings on my Prusa Mendel:
.35 mm nozzle at 185C
.2 mm layer height
.5 mm extrusion width
heated bed with blue tape at 60C
Send M106 to turn fans on while printing, to make sure the previous layer is cooled solid before the next layer is printed.
Turn off the heated build platform and let it cool completely before removing the rod, to avoid bending it while it's still soft.
If your printer is properly calibrated you should not need to predrill the holes for the M3 screws. Just screw them in, they are supposed to be somewhat tight for zero backlash. If you do need to predrill, use a 3mm or smaller bit. 1/8 inch (3.175 mm) would make the holes too big.
If your print bed is too small, you can print rod ends from joint.scad instead, and connect them with carbon fiber tube from the kite store.
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