KBricks -- quad and mini quad

thingiverse

My First Prints with the KBricks Systems - The Quad Demo and Quad Demo at 2:3 Scale. Getting my first successful KBricks build was a more challenging experience than I had anticipated. Some of the parts and fit were finicky, both to print and assemble. Lessons Learned: Print the connectors vertically. If you print them horizontally, the grain of the print is such that they break easily along the long dimension. Print the pegs and axles horizontally, for the converse of the same reason. Here comes my first remix; I un-meshed the peg and created a flatted version that would print more easily on its side (without supports). I did this un-meshing and editing in FreeCAD. I should probably go back and draw or modify it in OpenSCAD so that it can be posted back into the GIT repository. Axles and such were tight. I ended up printing my pegs about 3% undersized (except for length), and the steering wheel about 3% oversized (except for height) so that they would fit more easily. Everything printed smoothly with a .4mm extruder and .2mm layer height. The idea behind the mini version was that at 2/3rds size, the basic modulus would be 16 x 16 mm - the same as a 2x2 Lego brick. This print went pretty easily after learning the lessons of the full-sized print. The one issue was that the walls of the connectors were too thin to print. Using the original STL as a guide, I drew modified pegs with what would be 1.2mm walls at full size - .8mm scaled. I also made these a little longer for more engaging surface. I printed the scaled-down pegs at .12 layer height. Again, I did this in FreeCAD; I should redo it in OpenSCAD.