Parametric Tin Lid

Since creation, I have revisited this model, rebuilding from scratch to make http://www.thingiverse.com/thing:1336676. Please review both before setting on the right choice for your requirement.

I've seen a few tin lids, but no pictures of them in use and no precise idea of the size, so here we are. Unfortunately my unheated bed won't keep hold of this while printing. I'll figure it out, but in the mean time, I thought I'd release this.

If you think it needs tweaking, let me know.

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