In reply to @Ayliean
@Ayliean @MathsGear @wilderlab had a proper set made a few years ago, which I bought some of. As far as I remember, it was a right knacker to manufacture.
In reply to @christianp
@Ayliean @MathsGear @wilderlab Sorry, not @wilderlab at all! Not sure what I was thinking of. Anyway, the set I got was this: aperiodical.com/2012/09/penros…