Nothing worse than a physicist stupefied by the obvious

[redboat219]

Quote from Macgyver "Hell Week" episode.

This popped into my mind after coming across a post on an FB RC sub group.

The builder has essentially given up, saying it a "disappointment" and "discouraging" because vendors don't stock "oblong shafts" to match his 3D print.


a perfect example of a "CAD-induced" crisis. He designed a hole (or used a file) that assumes a specific, non-standard geometry, and now he's treating a simple mechanical interface like it's a proprietary aerospace component.


This is pretty much a DIY hobby, if the part doesn't exist, you make the part—or better yet, you don't design a hole that requires a unicorn to fill it.

He did the 90% that requires high-tech hardware and software, then got "stupefied" by the 10% that requires a hammer and a file.

[redboat219]

Off the shelf fix that doesn't require machining or additional work would be to use K&S brass stock.

Find a square brass rod or tube of the correct width that fits into the oblong 3D-printed hole perfectly. The flat sides of the square provide a massive mechanical lock against the flat internal walls of the print. No slipping, no "oblong" magic required. The gaps on the sides provide space for RTV or epoxy.

[Subculture]

It’s an issue for those who just buy a file and hit go on a printer.

A bit of basic work with some free software like Fusion 360 and you can have whatever shape and size of orifice he likes in those hydroplanes. Alternatively, a bit of basic benchwork with a file to whittle away at some round stock.

[redboat219]

It’s an issue for those who just buy a file and hit go on a printer.

When something does not include the caption "Download file", "PRINT" or "Add to cart" it doesn't exist.

[Akula54]

Yes, I found it inappropriate for the 3D designer (rcsubs.cz) to complain to the whole world about such a trivial matter.

I even replied with an obvious solution, which must not have been to his liking since he didn't react at all.
A file, a brass rod, and the problem was solved...

On a group frequented by experts and artists in the RC submarine community who all share their work (i.e.solutions), it's pathetic.