Building a full-auto Nerf Demolisher Part 4: I bring balance to the Demolisher after printing a few bits a whole mess of scrap plastic.

The before and after.

That profile tho!

Sing it with me: “It ain’t no fuuuun, if the hommies have an awkwardly positioned launcher/fore-grip at front of their blasters throwing off the balance.” So here’s the thing, I am not some un-feeling, joyless, monster, I honestly have a grin on my face as soon as I hear the pop of that grenade launcher, sending that foam who knows where. Is it fun to lob these in the air as far as possible?, we’ve gone over this – of course it is. Still doesn’t make up for crazy awkward feel this thing gives to anyone who loves that pop too – oh well. Let’s cut it off!

Sans launcher.

If you ever wanted to know if you could cut up a blaster with an Xacto knife come back to this page and read this again – yes you can but it’s totally not worth it. As you might guess I needed to find out for myself. Let me assure you, it’s something you don’t need to experience first hand.

Now before I get into the fore-grip story I think it’s totally worth it to call out the fact that there are lots of 3D printed parts becoming available in the hobby. In particular I think it’s warranted that I give a nod to Jase3D a guy whose fore-grip for the Demolisher is quite nice – actually I have 2 of ’em at the time of this writing – but with a shiny new printer on my work table I couldn’t resist making my own.

Measure 28 times and print 137.

Okay I didn’t really measure 28 times, nor did I print 137 things… I did do both though, A LOT. I assure you there was a method to the madness however, before going “all the way” I started out by printing reference pieces to check my measurements. Something that if I had not done it would have meant I’d be waiting for 6-8 hours, yes 6-8 hours, for each side of just the rear portion of the grip to print. After a few attempts I was able to dial it in then I started to think beyond just slapping a box on there.

I really wanted the styling to be in keeping with the design of blaster, something that if you looked at it too fast you’d think it was supposed to be that way. The angular nature of the Demolisher is what makes me a fan of it aesthetically, so I started there and focused on extending the lines of the shell.

Being that my printer – the virtues of which of I will extol here once again – is on the small side I had a limitation to work around. Having a smaller capacity, roughly 120mm x 120mm, meant I’d need to print the fore-grip in two sections… a limitation I found a way to exploit. I’m a Halo fan and an early Plasma Pistol/Battle Rifle cheezer – ok master practitioner – so I looked for some inspiration from the front end of the much loved and maligned BR.

Roughly .25kg of PLA later I had a fore-grip design that I think suited the launcher-less Demolisher quite well.

It took a while but I got there. I had to print the grip in two sections because mini printer = mini print capacity.

Yup, in four pieces.

Like a glove!

Now in dark gray!

Jam on it.

So remember how there’s a gearmotor mounted ever so nicely in the shell now?, well it lives where the jam door used to live – and since we can’t just go running around with our tallywackers flailing about, we gotta make a new jam door assembly. The old jam door slid back to open and sat in the rear outer shell recess, but at the front of the access port there’s enough “structural plastic” to pressure fit a block creating a mounting point for a hinged door. Add a couple of steel pins, a couple dabs of glue to keep the pins in, and we have a Stryfe styled flip-up up jam door to hide our shame.

Probably not the best idea to just run around without covering this hole up.

Added a little reinforcement where you are likely to squeeze.

Doors open mang!

So fresh and so clean.

You know how sometimes your 3D printer just decides that it doesn’t want to work anymore? After killing my heatbreak with a drill to clear an inexplicable filament jam, a week and change worth of waiting for parts and re-calibrating fun time I finally have a functioning printer I’ve given up on my MP Mini Select V1. The good news is that at of the time of this writing I was able to snag one of the first batch of MP Mini Select V2s to arrive on US shores so I’m back in business.

Set it and forget it, because this print is gonna take a while.

Next time.

Building a full-auto Nerf Demolisher Part 5: I make a flywheel cage without the goal of a lift in FPS.

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