Print-in-Place Slingshot - FOR MULTIMATERIAL PRINTERS ONLY

This slingshot is print in place. There is no need to do any assembly after, you don't need anything but a printer and filament for this. Take it off the build plate when it is done and shoot. Simple as.

But this is designed only for multimaterial printers, so a toolchanger or something similar. You can't print this on a regular printer because even if you have a mutlticolor unit like an AMS it won't be able to process the filament required for this.

You need to use two filaments for this. One rigid but one that will stick well to TPU so a PETG is best, we used carbon fibre for added rigidity but it is not absolutely essential.

The other filament is more important - you need to use a very stretchy TPU. An 95A TPU is not going to be very effective with this. The stretchier the better. We used a 30D TPU from Fiberlogy which has an elongation at break of 875%. It is not very difficult to print but it might require you to bypass any feeders or PTFE on your printer. 

We printed on a Snapmaker U1 feeding directly from the spool holder to the toolhead and for it to extrude well we reduced the tension on the extruder gear slightly.

It is designed for 20mm balls projectiles. You could do smaller but larger gets harder to hold as the pouch is a bit small.

Print the balls with all the walls you can fit in it - the denser it is the less affected it is by air resistance. And use a fuzzy skin texture for better grip as you draw back the band. With printed balls you can get over 4 joules of energy and over 30m/s initial velocity, it can easily reach a range of 25m. 

We also used steel bearings which are much harder to hold because they are so smooth but the energy out of them is insane. Obviously, be very careful using this slingshot. Don't use it in an irresponsible manner. Do not shoot at animals or people. We are not responsible for any damage or injury that might occur from using this.