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DonStick3l

Triple Compound Crossbow

by DonStick3l Aug 26, 2018
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OK, I know we are not supposed to use bad words on Thingiverse but HOLY CRAP!!! This design totally made my day! You, sir, are a genius and I am still trying to find my chin somewhere under the desk! I will definitely give this a try.
I have a question before I begin: What if I make the stressed parts from Carbon PLA? Would it give me more firing power?

hola se puede ver en algún lugar este monstruo funcionado. Gracias.

Where can I find the correct spring.
I juste spend two hours on Aliexpress, but cant find any 15 X 65 spring.
Have you any link for me ?

The spring was from a local hardware store but it actually does not need to have this exact dimensions. You can get away with using other dimensions by slightly altering the main spring guides's geometry. Or by using something different as a buffer in the central prism's bore.

Ok I start printing the parts and we'll see.

cant find the build manual :(

The PDF is the very first of the Thing Files in the downloads.
https://www.thingiverse.com/download:5281367

+1 for a request of video showing in off and in action for those of us who can't envision how this works.

hi! awesome design! i'm definitly going to print this, the compound bow was the most liked present last christmas.. could you give me some tips on where to find the spring?

Thank you! I love hearing all the stories of my design in the community.

I got the spring from Hornbach a german chain of hardware stores. You might find one in your local hardware store or on Amazon or something.
Yours does not need to have the exact same dimensions as mine. The requirements are Ø<16 mm, ~50 to 100 mm in length and relatively strong (1 mm wire or so, I do not have any NM specifications).
If the dimensions differ too much, a single small part, the "Trigger Spring Pivot", has to be modified. This can be done either in the slicer by scaling the part non-uniformly or by altering the STL.

What an awesome design! Would love to see a firing vid. :)

Can this be done and work well in 50% scale

I don't think so. Some parts, especially in the trigger unit, are already very filigree at 100% and would be nearly impossible to print at half scale. Also the design uses M3 nuts and bolts, the smallest you can generally get from hardware stores. And to my knowledge an ISO M1.5 thread does not even exist.

Incredible design! Well done :D