Those mold look awesome.  Love it

So I'm waiting for a large file to download on my crappy broadband.
Had a sheet of 360gm card to hand.
So I started folding

I will say that getting a really tight fold in such thick card does require quite strong fingers.

The smallest were made from a business card sized rectangle, the biggest from A6 (A5 folded in half.
The next one down from A6 folded in half and the smallest from that folded in half.

Obviously they are folded in half and cut into two pieces. Otherwise not even Magnus samuelsson would be able to fold it into an aerofoil.

The small ones might work in a sling.

I'll get back to the clay torusses tonight.

So I took them for a walk.
No they don't sling well lol.
Just can't get a straight release.
Then dream turned round and spotted what I was doing.
And that was the end of the larger one.

So slings aren't much cop with these, but they launch great from a straight stick !

Unfortunately by the point I tried to video it, I only had one of the tiny ones left. The two previous throws vanished into bushes, and the one I tried to video also vanished lol.
And I really should have changed to a thinner stick

So if you pretend you're using a naked staff sling, yes you can sling them

Anyone ever tried embedding fins in a clay glande like this thing? Clean release could be an issue I guess, but even off throws would give you rifling.

You've been a very busy bee C_A I love these designs. Really feels like there are boundaries being pushed.

Currently got a chap talking to me about maybe getting a rather nice looking resin printer for review.
Now, over the last couple years I've had 4 different companies offering to send me a machine - so far not a single one has ever turned up.
I am apparently an industry influencer (so I've been told)  - but not yet on youtube, just on the worlds largest 3d printer forum.
I've had a few designing jobs out of it and been sent some interesting filaments to play with - but so far no actual printers have arrived.

Now personally I reckon the forum probably gives me more clout than the average 3d printing youtuber - and there are thousands of them, and only one of me on the forum.
But the marketing wallahs do tend to have tunnel vision.
So I will start putting some more videos up, just because it can't hurt

I'm not actually getting that excited, 'cos like I said, this is far from the first offer I've had.

However this chap is a little different, he's freelance and not directly working for a specific company, like most of them tend to.
And seems to have worked out that my recommendation will probably sell more machines than a low end youtuber.
So who knows.

And why, you ask am I telling you this ?

The detail level and model architecture you can achieve with a resin printer is just phenomenal.
It's proper movie spy gadget detail level.
And with the price of resin dropping rapidly and differnt types becoming more easily available, resin machines are becoming a good viable alternative for tougher prints.  Previously the resins were known for their inherent brittleness.
The resin is still nasty smelly sticky stuff and you have to wash the prints in isopropyl alcohol and then blast it with uv light to finish the curing. But detail level, oh yeah !

So things like the delayed action glandes, would be easily doable.
They hinge on a really precise and smooth spiral track and tiny housings for ball bearings, that I just can't do properly with an fdm system.

But with one of the new generation resin machines - it would be a piece of cake. https://www.youtube.com/watch?v=mDTnmKMrfZI
This would probably be the machine.

Anyway we'll see what occurs.

well it turns out you can't make a two part mould with lift. It creates an overhang that will simply trap the clay.

So we shift to plan b.

A central 3d printed insert to a clay torus.

Sort of like a horizontal turbo glande - well, exactly like it, if you want to be pedantic

Time to get my thinking hat on again.

Tell you what, if nothuing else, this thread has given my brain a serious workout

JudoP wrote on Aug 21^st, 2021 at 4:33am:

I think an important part would be to make sure the fins are angled.  In arrows this is called helical fletching.  Based on my limited experience with the ice arrows I made, there wouldn't be any rifling without it.  If the glande itself was grooved, it might.  But I think straight fins would actually fight against the spin.  I could be wrong though.  A strong initial rifle spin created by the sling might still keep going.