this post was submitted on 29 Jun 2026
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Oddly Satisfying

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[–] aeiou@piefed.social 15 points 1 month ago (1 children)

This is blow molding, more common for soda bottles. Closed-top boats like kayaks are typically rotomolded instead.

[–] Gonzako@lemmy.world 8 points 1 month ago (1 children)
[–] Steve@startrek.website 7 points 1 month ago (1 children)

Squirt some liquid hot plastic into a closed mold and rotate it to coat the inside while it cools.

[–] Gonzako@lemmy.world 2 points 1 month ago (1 children)

How do you control for thickness there?

[–] rainwall@piefed.social 2 points 1 month ago

Likely amount of liquid and amount of rotation.