This is a flywheel cage and flywheels for a new Rival style blaster. This does NOT work in any current production piece. This is for a future blaster i am currently designing. Feel free to use it as you want. This is very much a working, yet evolving piece. There are small features that aren't applicable to this model but work on a larger whole. I am trying to use this in a modular pistol, carbine, and rifle, so there are purposeful features that might not make sense yet.
Print with the highest resolution you have time for. Mine were done at .06mm layer heights and 50mm/s outer shell speed. The more precise, the better. You'll most likely need to ream to holes to 2mm, as they're a tricky print. You can use a drill, just go slow to not over-bore them. A legitimate reamer would be better. 2mm or 5/64" (.0006" undersize, works great) The worse your wheels come out, the more this thing is going to vibrate.
You will need to use supports. Lay the part with the open face up, so that the motors would bolt on from underneath. Using Cura the supports pop out of the motor mount holes fairly easily and are easily cleaned off the mounting tabs. I printed this at .15mm layers and 50mm outer shell speed. This isn't too critical, your shell can have slop.
I highly recommend a rigid plastic for the flywheels, and the cage. PLA has worked well for me (solutech 1.75mm at 210C). The motors are affixed with 2.5 x 6mm screws, i recommend buying a large assortment if you plan on following this project.
Insert the motors and bolt them down. Then start the wheel on the shaft and push it flush using a flat surface. You can glue them if you feel so inclined, just try not to glue the motor solid. The wiring is fairly straight forward. I used solder and electrical tape. If you aren't sure what goes where, stick some wire in the battery terminals and play around until you get it. Don't short circuit anything, you'll create an instant fire. Just two parallel motors, one has switched polarity. You could add a switch, but this was designed to be plug and play on different blasters so it may hurt in the future. For wire, use whatever doesn't melt when plugged in. I'm no engineer.
I am not responsible for whatever you stick in this thing. It's fast, it has torque, and it will melt/burn your skin. It was only designed for Rival balls, may also shoot mega darts but not tested. This is higher powered than a standard rival gun (roughly 120-130fps. Larger wheels and motors on a battery like this have serious potential. Please be safe with it. It can shoot cheese balls.
What i used:
Battery (use whatever you want)
Motors (5 pack)