Flywheel Nerf Blaster: Mk41 - Royobion - Protean Remix

NOV 2024 update: Added a Beta Hurricane-sized version that is ~16mm narrower overall and is designed to maybe fit Roboman's machined hurricane/Flycore cages. Probably. Also revised the lower to give some more elbow room to wiring looms.

Basically it's a single-stage Flygonial Protean, but with a grip (Ryobi!) battery slot and a folding stock. Print file is laid flat but may need rearranging and some parts are better printed with support. I recommend dialing in trees/organic supports, but trees don't work awesome by default.

Answering the extremely common question up top: Yes, I just use regular motors on 20v with no special additional work or parts. I have been doing it on and off since 2018. In my experience, robust 3s like rhinos and valks work great. You DO NOT want 2s motors, as all 2s motors are wound to have similar performance to 3s motors with less volts - and since Amps and Volts are directly correlated, to get the same performance you increase Amperage and Amperage is what breaks stuff and injures people. I don't usually mess with 'twitchier' (higher performance in the same size factor = more amps through smaller wires) motors because they're more expensive so I can't really speak to using 20v on Hellcats or BB's or Krackens or whatever.

Adjustments from the Protean:

• Shortened the whole thing so the stock would work and redid the magwell angle to fit the adjustment
• Made a scorpion-style printed wire stock. It's cool and I'll use it - but it is long and could be bendy and may be better glued / reinforced. Needs gluing for assembly. Printed it at both my normal PLA 3-5 walls / 5% infill and 100% infill and the 5% worked just as well. Flex but doesn't break used correctly, needs to be field tested.
• Added a royboi battery adapter. Might adapt to other packs, could also be a grip battery for a normal XT-style connector but I'd have to make a fake battery box for that. Use "Keystone 209 Battery Contact Pieces" like these to connect the battery adapter: https://www.amazon.com/KEYSTONE-209-BATTERY-CONTACT-pieces/dp/B00LPOVJHS
• Cool benefit of the above: Only the motors actually need to be soldered; you can use blade connectors and crimps for everything else.
• Fixed some tolerances to require low/no post-processing
• Removed the ribs on the inside of the pusher frame - need to test this, but there's a designed-in support on the upper that might be clip-out and this should mean you can remove the upper independent of the wiring harness.
• Messed with the printed pins so they should work

Assembly images and process differences from the Protean:

1. The top part is almost exactly the same as the Protean, just with minor QOL and aesthetic tweaks to some of the parts.
2. The grip base is the first difference. Snap the keystone connectors on so the spring part is inside the battery tower. Snap the tower through the base plate and slide the whole thing into the grip. Screw it down with two #4 or M3 screws as indicated.
3. The stock adapter is also different. Screw it together, thread a knotted elastic through the top pin hole and pull tight, making sure the elastic doesn't slip out and the knot doesn't interfere with your ability to install a pin.
4. Slide the stock connector over the U-bar stock piece, align the bent stock arms (with slots toward each other) on the U-bar and push the stock connector down just enough to lock the first in, then set the other and push the connector down all the way. Glue if required.
5. Put the rectangular pieces in the slots in the stock arms, assemble, glue if desired.
6. Stock should be assembled; place the rear stock spacer in and install with pins to the stock adapter. Glue stock pins after completing all the steps and checking function.
7. (images 7-9) Run the elastic through the gap in the stock adapter and into the stock spacer
8. (image 10) Wire up as usual. Changes made should include the ability to wire with the upper removed for significantly easier assembly. Add grip panels and a pack and let it rip!

NOV 2024 update: Added a Beta Hurricane-sized version that is ~16mm narrower overall and is designed to maybe fit Roboman's machined hurricane/Flycore cages. Probably. Also revised the lower to give some more elbow room to wiring looms.

• Shortened the whole thing so the stock would work and redid the magwell angle to fit the adjustment
• Made a scorpion-style printed wire stock. It's cool and I'll use it - but it is long and could be bendy and may be better glued / reinforced. Needs gluing for assembly. Printed it at both my normal PLA 3-5 walls / 5% infill and 100% infill and the 5% worked just as well. Flex but doesn't break used correctly, needs to be field tested.
• Added a royboi battery adapter. Might adapt to other packs, could also be a grip battery for a normal XT-style connector but I'd have to make a fake battery box for that.
• Fixed some tolerances to require low/no post-processing
• Messed with the printed pins so they should work