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Mechanical Watch: Exploded View

(fellerts.no)
1168 points fellerts | 1 comments | 22 Jun 25 14:56 UTC | HN request time: 0.206s | source
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hinterlands ◴[22 Jun 25 15:19 UTC] No.44347626[source]▶
I've done some projects like that, although not with as many parts! I think the main disappointment that awaits the author is that within two years or so, the epoxy will turn yellow. These resins are unfortunately not UV-stable, even if kept in a reasonably well-lit area indoors (bookshelf, etc).

There are resins you can use for projects like that if you want them to last, but they're less fun to work with.

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fellerts ◴[22 Jun 25 15:23 UTC] No.44347670[source]▶
Modern epoxies often claim to be UV stabilized, and as far as I can tell, this is a relatively recent advancement. For reference, I used Entropy CCR (slow cure) for the final model: https://entropyresins.com/product/ccr-clear-casting-epoxy/

I guess we'll wait and see!

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1. hinterlands ◴[22 Jun 25 15:46 UTC] No.44347842[source]▶
We had UV-stabilized resins for the past two decades or so, but it just slows down the process. I used several UV-stabilized products and it just doesn't last.

For the UV-stable options, you have polyesters (which are very smelly) and premium aliphatic polyurethanes (which are finicky to work with).