I have no actual experience with this, but have heard of two systems:

Clone Your Bone, perhaps the most well known option. Produces a dildo made of wax, apparently.

Create a Mate creates a dildo of what appears to be standard rubbery dildo material.

Like I said, I've never used them and have no idea which is best, but thought I'd point you in a direction anyway!

Would love to see pics, of either the process or just the end result!

CasperTG

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You know, Blackadder, for me socks are like sex. Tons of it about and I never seem to get any.

My Photos:
https://imgur.com/a/80hiRdm