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General >> General Slinging Discussion >> 3d printed staff sling heads
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Message started by Kordwar on Dec 5th, 2021 at 2:20pm

Title: 3d printed staff sling heads
Post by Kordwar on Dec 5th, 2021 at 2:20pm
First and foremost: Hello! Just got approved to join and am hoping to hit the ground running.

I became interested in staff slings after watching a David Morningstar video and considered trying to make one. I had an idea at work about using a broom handle as the basis and thought "why not use the threads and make it interchangeable?" did some digging and evidently no one had already done it (or my search terms weren't correct) so I fired up fusion when I got home and took a shot at it. Printed in resin but I think regular FDM should work fine as well.

Finally did some testing today and it seems to be a rousing success

As a side note: did you know that you can get broom handles for a dollar at dollar tree?




Title: Re: 3d printed staff sling heads
Post by czechslinger1.0 on Dec 5th, 2021 at 2:48pm
hmmm, interesting

Title: Re: 3d printed staff sling heads
Post by SAK_Survival on Dec 5th, 2021 at 10:25pm
This is awesome!  I love it when people mix the super primitive with the super modern.

Good Job.

Title: Re: 3d printed staff sling heads
Post by IronGoober on Dec 5th, 2021 at 11:33pm
Do you have an .stl or a .scad file to share? I'd love to print one of my own. I still have yet to try a staff sling.

Title: Re: 3d printed staff sling heads
Post by NooneOfConsequence on Dec 6th, 2021 at 11:27am
Looks great!  Ditto what IG said… unless you plan to sell these, please do share the files.  I’d love to try it out too

Title: Re: 3d printed staff sling heads
Post by Kordwar on Dec 6th, 2021 at 12:18pm
I am happy that people are interested! I need to do more testing before I consider possibly selling them, but I will happily upload the stl when I get home from work so people can put it through its paces

Title: Re: 3d printed staff sling heads
Post by joe_meadmaker on Dec 6th, 2021 at 12:45pm
Agreed, really nice design!  I look forward to hearing about test results.

Title: Re: 3d printed staff sling heads
Post by NooneOfConsequence on Dec 6th, 2021 at 12:55pm
We’ll be happy to test the design for you!

Title: Re: 3d printed staff sling heads
Post by Kordwar on Dec 6th, 2021 at 5:54pm
I am home, so here is the stl. If I do end up selling the file and/or prints of it I will still make the stl free to members of the forums, wouldn't feel right otherwise.
https://slinging.org/forum/YaBB.pl?action=downloadfile;file=sling_staff_head_mk2.stl (1375 KB | 16 )

Title: Re: 3d printed staff sling heads
Post by Kick on Dec 7th, 2021 at 7:05am
That is really cool. As a lover of staff slings, it's cool people are taking an interest in them.

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Dec 7th, 2021 at 7:21am
Where does the retention cord attach ?
And why not make the release curve adjustable :-)
Might as well build some extra features in, that's the beauty of 3d printing.

Using the threads Is  a good idea :thumb:

So what printer do you have ?

I'm as much a 3d printing anorack as a sling anorack :-)

Title: Re: 3d printed staff sling heads
Post by Kordwar on Dec 7th, 2021 at 7:47am

Curious Aardvark wrote on Dec 7th, 2021 at 7:21am:
Where does the retention cord attach ?
And why not make the release curve adjustable :-)
Might as well build some extra features in, that's the beauty of 3d printing.

Using the threads Is  a good idea :thumb:

So what printer do you have ?

I'm as much a 3d printing anorack as a sling anorack :-)


Retention cord goes around the groove, I just used a tight bowline for mine but during testing yesterday it moved around a bit so I am going to retie it. Hm, snap in or dovetailed release curve tips could be interesting! I started on a Tevo Tarantula several years ago and  eventually moved on to a Tevo Tornado. My most recent one is a Mars 2 mono.

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Dec 7th, 2021 at 8:09am
A little vertical hollow cylinder attached to the back/front of the tip to tie the retention cord in should work well.

And a hoopak tip would work well too.

How are finding the added post processing of the resin machine ?
And dies the resin smell as bad as people say ?

Currently thinking about getting a small resin machine. Some decent looking ones around for less than 100 quid these days.
It's just the extra hassle that puts me off lol

But there's no question the results are damned impressive

How long did that part take to print ?

Title: Re: 3d printed staff sling heads
Post by Kordwar on Dec 7th, 2021 at 8:37am

Curious Aardvark wrote on Dec 7th, 2021 at 8:09am:
A little vertical hollow cylinder attached to the back/front of the tip to tie the retention cord in should work well.

And a hoopak tip would work well too.

How are finding the added post processing of the resin machine ?
And dies the resin smell as bad as people say ?

Currently thinking about getting a small resin machine. Some decent looking ones around for less than 100 quid these days.
It's just the extra hassle that puts me off lol

But there's no question the results are damned impressive

How long did that part take to print ?

I was a little worried about stress being focused on a pipe but in retrospect a hole on the back that you thread a knotted cord up beyond the threads would work great and be even simpler.

The resin doesn't smell terrible, but the post processing is a bit of a pain at times. I need to get a wash and cure station to remove some of said pain. Resin is wonderful though, the detail is nuts.

I think it took like three hours? I can double check. I could probably do it in half that on the tornado, I have a .6mm nozzle in it currently from a previous set of prints for work

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Dec 7th, 2021 at 9:33am
The main reason I was thinking of a small resin printer is the fact that I'm not sure I want a large container of isopropyl alcohol in my workshop.
A biggish mason type jar, not a problem.
Plus it would only be for small detailed stuff and to learn the format.

Yeah I thought after, all you'd need is a hole.
Thread through, knot before and after, job done :-)

Small box lined with foil and a cheap ir illuminator, would work for a curing chamber. Plus store the Iso jar in when not in use.

Wonder if you could wash, then just leave it in the alcohol while you zapped it with ir light.
That would save some buggering about :-)

Plus the cost of resin has really dropped

What brand do you mostly use ?

Title: Re: 3d printed staff sling heads
Post by Kordwar on Dec 7th, 2021 at 9:50am
I have a big UV light that's within the right wavelength and just aim it at my print for a bit at different angles, but I have considered building or buying a little rotating base.

Honestly I just keep my IPA in a Tupperware container, close the lid and slosh the part around and then do finer details with a toothbrush to get everything.

I mainly use elegoo, I particularly like their ABS like. I did it in the clear green because that's what was in the vat and I am lazy >.>

I'll probably make the changes tonight after work and upload a mk3

Title: Re: 3d printed staff sling heads
Post by NooneOfConsequence on Dec 7th, 2021 at 12:48pm
https://m.youtube.com/watch?v=ESabnoRsKdQ&feature=youtu.be&t=55s

If you can solder, you can easily build a turntable for under $20.
This video used a cheap lazy susan from Amazon with an N20-size motor hot glued to the bottom.  The motor shaft is keyed, so I printed a wheel to fit the shaft and put a 1” rubber band on the wheel for friction.  The motor speed is controlled by a cheap pwm controller and powered with an 18650 battery I had lying around.

Title: Re: 3d printed staff sling heads
Post by Kordwar on Dec 7th, 2021 at 8:38pm
Got distracted after I got home, finally sat down at the computer. I have added a hole embedded in the groove, so now you can tie a retention cord or run it though the hole with a knot on the end. If you want to be especially fancy I guess you can do both and braid them?

Quick update: with my current setup they print on FDM in about an hour and ten minutes, but it's rough (.3 layer height with .6 nozzle). Running a cord around the groove and doing a three strand braid with the knotted center looks very snazzy.
https://slinging.org/forum/YaBB.pl?action=downloadfile;file=Staff_sling_head_mk3.stl (1326 KB | 18 )

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Dec 12th, 2021 at 1:25pm
Nice, I'm still looking for broom handles for a couple other projects.
Not as easy to getb hold of as you'd think.

My theory with lining a box with aluminium foil is that it reflects uv light (probably) and thus even with a top mounted light, you should get really even exposure all round the model without any rotation needed.
Round the corners out and it should work even better.

Title: Re: 3d printed staff sling heads
Post by Rat Man on Dec 12th, 2021 at 3:26pm
Excellent and welcome.

Title: Re: 3d printed staff sling heads
Post by Kordwar on Dec 12th, 2021 at 8:12pm

Curious Aardvark wrote on Dec 12th, 2021 at 1:25pm:
Nice, I'm still looking for broom handles for a couple other projects.
Not as easy to getb hold of as you'd think.

My theory with lining a box with aluminium foil is that it reflects uv light (probably) and thus even with a top mounted light, you should get really even exposure all round the model without any rotation needed.
Round the corners out and it should work even better.


I am surprised that cheapo broomsticks aren't available at poundland (if you have one in your area, I don't know how widespread it is there) or something akin to it.

I think I have seen people use those LED strip uv lights to make cure boxes, it's definitely worth looking into.

Also: Thank you Rat man!

Title: Re: 3d printed staff sling heads
Post by Gaius Marcellus Nerva on Dec 15th, 2021 at 7:27pm
This is a really cool idea.  I can’t believe I never thought of this before. If you ever do sell them I might be interested.

Title: Re: 3d printed staff sling heads
Post by Kick on Dec 17th, 2021 at 8:15am
Same here. With something like a mop handle, I might be able to make a takedown staff sling and bring one to the competition with me :D

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Dec 17th, 2021 at 9:29am
poundland, home bargains, indian hardware shop (who usually has everything) poundstretcher - no 'just broom handles'.
Weird, I'd have sowrn they all used to sell them.

I'm putting off going to b&q as the handles will cost more than the brooms from anyone else.
But I hate buying something just to throw the expensive bit away :-(

Haven't looked on amazon yet.....

Well, could have got 10x4ft by 23mm on amazon for £18
1 for £6

But ended up buying 20x from ebay for the same £18.
Unthreaded.
I mean that's what glue and screws are for :-)

I know it sounds like a lot of broom handles - but it's a remarkable useful size and shape bit of wood.
And I genuinely need a new handle for the snow shovel.

Plus the other project could end up using quite a lot of extra handles :-)
And, as they say in ireland: 'a bargain is a bargain, begorrah !'

And at less than a pound a stick - figure it's worth stocking up :-)

Probably won't get them till after christmas.

A collapsible/foldaway/sectional staff sling.
Would seem pretty easy.

When I get my sticks I'll make one :-)

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Dec 17th, 2021 at 12:50pm
Ps. broom handles with a plastic threaded end are £1.97 at b&q

Actually not a bad price at all.

But as I don't want a threaded end, and I don't want to go to Burton, I'll just wait for my bargain bundle :-)

Title: Re: 3d printed staff sling heads
Post by Kordwar on Dec 17th, 2021 at 2:54pm
Has anyone tried to find out the upper limit on sling staff length? At what point does it become a portable trebuchet?

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Dec 20th, 2021 at 8:23am
Well it's ALWAYS a portable trebuchet.

Or better to say a trebuchet is a semi-portable large scale staff sling.

Length.
Well I'd say that's mainly limited by two things.

1) ease of use. IE reloading and throwing

2) ease of transport.

Like with long slings there has to come a point where it's just too unwieldy and you get more distance with shorter easier to use staffs.

I reckon you could probably go to 8 feet fairly easily.
And obviously the size of the slinger will come into it.

I'd love to get Hathor bjornsson into slinging

Six foot 9, 400lbs of just pure ultra fit muscle.
And he's fast as well.
That bloke could probably break all existing sling records and create a whole new bunch as well.

Unfortunately we don't have any currently active Icelandic slingers. We used to have one, but he's not been around for ten years or so.
So little chance of getting someone to 'ambush' thor with a sling demo.

Title: Re: 3d printed staff sling heads
Post by Kordwar on Dec 20th, 2021 at 8:48am
Granted I would need help reloading it, maybe I should try one of those 15ft extension poles that I have at work

Title: Re: 3d printed staff sling heads
Post by David Morningstar on Dec 20th, 2021 at 9:19am

Cool thread.

This is the longest staff sling I have seen used, he lays the pouch and cords along the ground like a trebuchet. It looks like he is getting plenty of power into the throw.

https://www.youtube.com/watch?v=_ajTNkvAqt4&ab_channel=FingerAngle

Title: Re: 3d printed staff sling heads
Post by Jaegoor on Dec 20th, 2021 at 9:22am
Nice

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Dec 22nd, 2021 at 1:12pm
Not that long and quiteva short sling.

So the question is:

Long staff with short sling
Short staff with long sling
Or long staff with a long sling.

I feel a new video by Joe is needed :whistle:

Title: Re: 3d printed staff sling heads
Post by joe_meadmaker on Dec 22nd, 2021 at 2:55pm

Curious Aardvark wrote on Dec 22nd, 2021 at 1:12pm:
I feel a new video by Joe is needed :whistle:

From me it will unfortunately be a little while. :(

To this day I've still never used a staff sling.  Two weapons are on my agenda for next year as soon as the weather starts getting warm again.  Staff sling and bolas.  Never used either, and very much want to try both.

Title: Re: 3d printed staff sling heads
Post by Kordwar on Dec 22nd, 2021 at 4:26pm
You were kind enough to send me some leather, I can send you a sling staff head or two

Title: Re: 3d printed staff sling heads
Post by joe_meadmaker on Dec 22nd, 2021 at 8:27pm
Right on!  I'd never say no to that deal.

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Jan 6th, 2022 at 10:52am
Also bear in mind how much easier it is to use a staff sling with gloves on Joe :-)
Snowballs !

Got all my broom handles just before Christmas.
Really nice, all I've checked so far are straight with no large knots. Quite impressed.

Currently working on two different ideas.

One is a standard printed head that takes different inserts.
Figured easy to exchange tips held in with a through bolt, might be an easier way to do it.

Currently using laser cut '3' mm ply.
The problem is that it's not actually 3mm and I didn't measure the exact thickness, before printing the first broom top.
Cut a hoopak tip.
It's nearer 3.5 and will not fit.
Plus arms need to be wider and longer.

The 3d printers are actually a lot more dimensionally accurate the the laser cutter.
That's got the world's cheapest controller board, really suffers in cutting accuracy because of it.
Image engraving is spot on. Soni know the actual mechanics of the machine are fine.
Just the way the board drives the stepper motors for continuous cutting or engraving is pretty iffy.

I do have some 3mm acrylic. But while really stiff, it is extremely brittle and I reckon plywood is probably a better bet for a staff sling. I might try it.

So currently reprinting the broom head with a wider insert socket.
I also need to make the tips a bit bigger.

I might also try a straight printed insert.

Although using inkscape to draw a 2d outline for cutting, is actually much easier and quicker. Than creating a 3d model with openscad.

And it's only just occurred to me that I can take that 2d drawing and extrude it into a 3d model  duh !
Well that will certainly make printing the inserts a lot quicker and easier :-)

The head hammers on to the broom handle no problem. And I've put 3 screw holes for permanent attachment, although as I have to also use a hammer to remove the head, not sure screws are strictly necessary, and 1 would probably be sufficient.

There's also a through hole for a bolt to hold the insert securely in place.

The other idea would be like kordwars, and an all in one socket and tip.
As I'm currently using polyurethane - mainly because it laughs at hammers.
Not sure if the tips of a hoopack would be stiff enough.

So that needs testing.
Right took some pics, so I'll go sort those :-)
20220106_155742.gif (4449 KB | 17 )
1641484405937.jpg (302 KB | 13 )
20220106_160115.gif (6995 KB | 14 )

Title: Re: 3d printed staff sling heads
Post by Kordwar on Jan 6th, 2022 at 11:28am
Looking good! If you made the hoopak Y sorta hollow you could use a long bolt to reinforce it and epoxy or friction fit a cover on the hex end.

I liked the idea of a dovetail to slide different heads on, just haven't gotten around to taking a shot at it yet.

Title: Re: 3d printed staff sling heads
Post by NooneOfConsequence on Jan 6th, 2022 at 12:29pm
@kordwar: the hole in the one you sent me was just right for an M5 screw.  I took the boat sling you sent, clamped the release cord between two washers and used the finger loop over the hook.  Works great!

Title: Re: 3d printed staff sling heads
Post by Kordwar on Jan 6th, 2022 at 12:40pm

NooneOfConsequence wrote on Jan 6th, 2022 at 12:29pm:
@kordwar: the hole in the one you sent me was just right for an M5 screw.  I took the boat sling you sent, clamped the release cord between two washers and used the finger loop over the hook.  Works great!


Awesome! It never occurred to me to try that, the mason line I used should be able to stand up to some abuse.

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Jan 7th, 2022 at 11:10am
Well the flat slot is only there because I was going to laser cut the different tips.

But now, thinking make it a screw socket and just print screw in attachments.

Basically right back to your original idea, just with a socket that can be made to fit any piece of unthreaded wood.
That way the whole thing can be made stronger and it's a lot easier to change ends.

I'll have a play later, got bloody cold in my workshop again.
We had the warmest new year on record, but back to freezing temps now.

I think I can reuse the script from the light up ammo and just add a full twist to the thread, instead if a quarter turn.
Shouldn't need more than that.

Oh and I have just ordered a voxelab proxima resin printer.
Pretty much the cheapest one around, but YouTube reviews have been trending so the bloody thing has gone up in price by 20 quid in the last 4 days.

If I don't like it, I figure I can wait 2 weeks and sell it for 160 lol.

I also ordered some water washable resin.
Cheap as the alcohol wash stuff, but apparently really low odour and you just rinse under the tap.
Which sounds like a much better idea :-)
Currently doing some research on exactly what wavelength uv light I need for final curing.
Well I've got a mate who's a top flight industrial chemist doing it for me lol

I did discover that aluminium reflects UV light better than anything else. So a foil lined cardboard box it will be :-)

Title: Re: 3d printed staff sling heads
Post by Kordwar on Jan 7th, 2022 at 11:33am
The nanometer rating the resin will need should be right on the bottle. I am slowly but surely working up the courage to buy supplies to make silicone molds and start casting heads and/or glandes from urethane resin. I printed a mold on my resin printer and did a test run with hot glue and it worked surprisingly well. One side with a socket for a nut, then flipping it over into a fdm printed holder and setting the nut and molding the other half with it inside. I was going to test them this weekend but it just snowed and they're white -_-

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Jan 7th, 2022 at 11:51am
The machines run at 405nm and that's what all the resins work with.

But Colin reckons that maybe 365 would give a faster harder final cure.
And if that what Colin reckons, that's what I'll go with.

Title: Re: 3d printed staff sling heads
Post by joe_meadmaker on Jan 8th, 2022 at 6:06pm
The first one is done and I think I'm in love.  I finished it just before dark, so I only got to throw one ice ball.  But that felt freakin' great!

I have the staff done for a second one (thanks to Kordwar for the staff heads :thumb:), but still need to make the sling part.  I'll do it tomorrow if I get a chance.

This one is pretty short.  It was made from a little tiny rake.  Most of the tines were broken so it needed to be repurposed anyway.  The staff length is 41.5 in (105 cm).  The sling length is about 27 in (69 cm) to center pouch.  The staff of the second sling will be about 56 in (142 cm).  The plan is to make the sling part the same length for initial experimentation.  I'll post a pic of the second one once it's finished.
ShortStaffSling.jpg (152 KB | 16 )

Title: Re: 3d printed staff sling heads
Post by Kick on Jan 9th, 2022 at 5:42am
Yes! Another staff sling convert!

Title: Re: 3d printed staff sling heads
Post by joe_meadmaker on Jan 9th, 2022 at 12:34pm
I got the longer one done this morning.  Here's a shot of them together.

Unfortunately it's a rainy wet mess today, as usual.  So no chance to try it yet.  I'm making ice balls and hoping the weather give me a nice day soon.
TwoStaffSlings.jpg (157 KB | 19 )

Title: Re: 3d printed staff sling heads
Post by Kordwar on Jan 9th, 2022 at 12:42pm
Those look fantastic! Looking forward to seeing what you can do with them!

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Jan 10th, 2022 at 8:04am
Nice one Joe !

Staff slings are a whole different process.
The best thing about them I find, is that the missile always goes forward. (Or straight up :whistle: )
Release is controlled by acceleration. And that's all you ever need to change to hit anything.

They are the ideal sling for people who lack any kind of hand eye coordination.
And we've all had 'pupils,' like that.

In many ways, it would make more sense for people to start their slinging journey with staff slings and then move on to hand slings, rather than other way round.

Fascinated to see how you get on with them :thumb:


@kordwar
Resin machine coming this week, so I've been cramming all the new stuff over the weekend.
Presumably you printed the heads with the threaded hole facing downwards, so the resin could drain ?
How easy is it to remove the supports ?
Or am I missing something obvious ?

If you punched a hole or two through the model so resin could drain from the top, would that make it easier to post process and reduce resin wastage from the supports.
Or, again am I missing something :-)
Starting the 3d printing journey over with a completely different technology is kinda cool.
Although I have just realised that I'll need some way of levelling the machine as not one single surface in my workshop is actually level !
Something irrelevant for fdm printers.

Title: Re: 3d printed staff sling heads
Post by Kordwar on Jan 10th, 2022 at 8:19am

Curious Aardvark wrote on Jan 10th, 2022 at 8:04am:
@kordwar
Resin machine coming thus week, so I've been cramming all the new stuff over the weekend.
Presumably you printed the heads with the threaded hole facing downwards, so the resin could drain ?
How easy is it to remove the supports ?
Or am I missing something obvious ?


So, I kinda cheat in that regard. I bought a magnetic flexible build plate so I could print flat without supports and just twist it to pop the print off instead of having to go at it with a scraper. I printed my first heads solid with no infill, which kinda wastes resin but also is nice and solid. I printed it with the threads down, though now with a hole for the retention line it should drain by itself.

The most frustrating part of resin printing is adhesion, if you don't have a solid grip on the plate it will stick to the FEP (the clear plastic bottom of the resin vat)
And you won't really know until it gets high enough to see. At which point you swear, take the failed print off, filter the resin out and gently pry the rest of the failed print from the FEP, refill, reslice and try again.

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Jan 10th, 2022 at 8:39am
Great idea !
I'll look into that.
The voxelab proxima is in fact a flashforge foto 6
So I get the flashdlprint slicer and a much larger user group and presumably, a more extensive upgrade and modding path.

I also reckon, with washable resin I can probably fdm print spare vats from pla as there is no heat issue to worry about.
Was also thinking about maybe using laminating pouches to make a dirt cheap fep replacement.
Not sure what's so special about the fep film, but there should be an easy DIY alternative. :-)

Transparency of the film and watertightness  of the vat would seem to be the main criteria.
Pretty sure that's not going to be too hard to achieve.
We'll see lol

Title: Re: 3d printed staff sling heads
Post by Kordwar on Jan 10th, 2022 at 8:55am
It's kinda special because it lets like 97% of the UV light through, a pack of them is also pretty cheap (they're considered a wear part), you can even buy rolls of it and just cut them out. It's a tension thing too, they're tight like a banjo head so things can lift off and break the surface tension.

It's a fascinating process, I wish you the best of luck with the printer! If you have questions or anything feel free to reach out and I will do my best to help

Title: Re: 3d printed staff sling heads
Post by Curious Aardvark on Jan 10th, 2022 at 9:11am
UV light and solar powered turntable just arrived :-)
20220110_140953.gif (4828 KB | 8 )

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