Originally shared by Jeff Keegan Aha! Found a problem with Greg's Hinged Accessible Extruder

3D Printing
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Originally shared by Jeff Keegan

Aha! Found a problem with Greg’s Hinged Accessible Extruder that I somehow missed for the past year. There’s an error in the scad.

I’ve rendered many Greg’s accessible extruders and was always irritated that the holes for the motor still had to be drilled through, and the hole in the center where the hobbed bolt goes needed to be awkwardly drilled through the bearings.

Yeah. That’s because there are references to a variable called “layer_height” that doesn’t exist.

There is a “layer_thickness” variable set to 0.4, but no layer_height. I set it to 0.4 as well, and sure enough, the motor holes now go pretty much all the way through and the hole in the center where the hobbed bolt goes is there.

So much better.

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Something that will also cause regular errors for me in openscad projects, is a cylinder that is differenced from a cube that has the same dimension as one of the cube sides. As the curve meets up with the cube wall, CGAL doesn’t produce a manifold object.

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I have layer_thickness and layer_height, both were set to 0.30. I thought then holes needed to be treated as bridges because the holes above these (you’ve mentioned) are smaller than the lower holes.

My bridging over the bearing area is always droopy, and always needs to be heavily filed. But they work. Printing one now!