Testing a 3d printed repeating crossbow (Slinghammer) with 80 lbs limbs and steelballs

The Slinghammer - a 3d printed repeating crossbow for different sizes of steelballs.

We like shooting with bow and arrow in our backyard (which is really huge and surrounded by fields). I also want to buy a repeating crossbow, so I was watching several review videos. I landed on a video of Jörg Sprave's Slingshot Channel ‪@Slingshotchannel‬ where he is showing a 3d printed crossbow. (And which has enjoyable content at least for me - großes Lob und Danke Jörg, solltest Du das jemals lesen, Grüße aus Österreich)
I looked it up un Cults3d and was totally hooked. A few clicks and Euros later the files were mine. Huge shoutout to Dondipper on Cults3d, great work.

I built it in the 10mm steelball version (materials below) and tested it with 9,5mm steelballs and it totally blew my mind. Great quality and great power.

General advice:
use something to make the string glide like string wax or silicon spray
wear safety glasses. If that steelballs hit anything hard, they will bounce back
be aware that there is no locking mechanism, so only cock it, when you are going to shoot

Files on Cult3d (files for printing, instructions, variants):
https://cults3d.com/en/3d-model/vario...

original Video of Jörg Sprave:
   • Modern Day Ballester: So Cool!  

Things I used (Some of the following links are affiliate links marked with * in the description, which give me a little commission without changing the price for you.)

PLA I used in this video for printing the parts according to instructions*:
Snapmaker black: https://amzn.to/3u7alBW

set of springs* (every type that needed is included)
https://amzn.to/3QGCeJN

set of different steel ball sizes*:
https://amzn.to/3UwBWHz

10mm steel balls*:
https://amzn.to/3w6WpcG

EKArchery Cobra 80 lbs limbs:
https://www.ebay.at/itm/134298864168

I ordered the scews here but they are available in any hardware store https://www.schraubenking.at/

General Setup:
I use a Raspberry Pi for Octoprint (Model 3B or higher, I use 3B)* https://amzn.to/3O7qv4B
Take a look at Octoprint here: https://octoprint.org/

find Snapmaker products on Amazon*: https://amzn.to/3AOYjNN

Stand for filming with mobile phone* (which is really great): https://amzn.to/3G0jO0O

Cameras I use for filming inside enclosure and as webcam*:
Logitech C920 Full HD*: https://amzn.to/3JJNnpX
Logitech Brio 4k*: https://amzn.to/3YUmYKe

I use a Raspberry Pi for Octoprint (Model 3B or higher, I use 3B)* https://amzn.to/3O7qv4B
Take a look at Octoprint here: https://octoprint.org/

things I use for measuring*:
sliding caliper*: https://amzn.to/3NesULp
goniometer for angles*: https://amzn.to/3Rdj8do
try-square*: https://amzn.to/3NgP9QC

My desktop setup:
LG C2 42" OLED*: https://amzn.to/469fNBz
ElGato Stream Deck*: https://amzn.to/47rkHM1
similar straight version*: https://amzn.to/3ucXe2n
Mic*: https://amzn.to/49Vxlmy
Audio Interface*: https://amzn.to/3Ui0Qt0

00:00 Start
01:09 printing the parts
01:25 finished crossbow
03:16 shooting increasin layers of cardboards
05:56 shooting cardboards, birch wood and mdf
08:30 closeup