Along the same lines as the MPCNC pen holder, I now have one for the 3018:
The body happened to be slightly longer than two LM12UU linear bearings stacked end-to-end, which I didn’t realize must be a constraint until I was pressing them into place:
In the unlikely event I need another one, the code will sprout a
max() function in the appropriate spot.
Drilling the aluminum rod for the knurled ring produced a really nice chip:
Yeah, a good drill will produce two chips, but I’ll take what I can get.
There’s not much left of the original holder after turning it down to 8 mm so it fits inside the 12 mm rod:
Confronted by so much shiny aluminum, I realized I didn’t need an 8 mm hole through the rod, so I cut off the collet shaft and drilled out the back end to clear the flanges on the ink tubes:
I figured things would eventually go badly if I trimmed enough ink-filled crimps:
The OpenSCAD source code as a GitHub Gist: