Materials needed:

M3x4 set screws x2

M3x2 set screw x1

Description:

I used to consider printed rifling a difficult, even impossible(if you pursue a good effect) task for FDM because of layer lines. So I made quite many SCARs out of low friction fishing thread.

but I am not satisfied with the strings pulled straight. I wanted curved riflings sticking to the barrel. then I gain inspiration from group chats

well, though I tried, my FDM was not able to process a groove for strings with 0.5mm diameter.

o I eventually made this. print rifling seperately in a direction that completely avoid layer lines, shown as the screenshot

(wrong printing direction for the cap, I just realized it when typing this)

and don't forget the cap or they might fly out together with darts(though I've never seen that happen without the cap)

and could any of you plz tell me how do I call this in English? and what are 'CAR' short for?

Rifling information:

length:100mm

twisting angle:30°