I've just finished putting my Belfry OpenScad Library (BOSL) up on github at: https://github.com/revarbat/BOSL Documentation at https://github.com/revarbat/BOSL/wiki It's a re-organization of the GDMUtils.scad tools that I wrote and used extensively in my Snappy-RepRap printable printer project. ( https://github.com/revarbat/snappy-reprap ) It has a lot of features, but here's some of the prominent ones: Readability shortcuts like: up(5) {...} zrot(30) {...} yscale(1.5) {...} xflip() {...} Duplicators like: xflip_copy() {...} zrot_copies([30, 45, 60]) {...} zring(n=6, r=20) {...} xspread(n=4, spacing=10) {...} Mutators like: skew_xy(xa=15) {...} left_half() {...} chain_hull() {...} Masks like: fillet_mask_x(); chamfer_mask_y(); fillet_cylinder_mask(); Shapes like: upcube(); // Cube centered on top of XY plane (bottom of cube at Z=0) chamfcube(); rrect(); // Cube rounded just on vertical edges. rcube(); // Cube rounded on all edges. chamf_cyl(); rcylinder(); pyramid(); prism(); right_triangle(); trapezoid(); // USEFUL! teardrop(); onion(); // 3D teardrop tube(); torus(); Complex shapes like: thinning_wall() // A wall that thins in the middle to reduce filament usage. thinning_triangle() // A right triangle that thins in the middle to reduce filament usage. sparse_strut() // An open cross-braced wall optimized for bridged support-less 3D printing. corrugated_wall() // Wall optimized to (hopefully) reduce shrink warp stress. And more: Metric screws and nuts Involute gears and racks. LMxUU Linear bearing clamps Trapezoidal (ACME) threaded rods and nuts Snap-together joiners V-Groove Sliders and Rails NEMA steppers and mounts 3D paths and Beziers. Wiring bundle rendering Quaternion math - Revar -- Sent from: http://forum.openscad.org/