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Buzz Bee Big Blast 3-D Printed 8-Shot Turret

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#1 louiec3



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Posted 30 July 2018 - 05:56 PM



So in my incessant thrifting I came across a pair of Big Blasts and immediately had a great idea for one: I wanted to cleanly integrate a nice turret capable of rear loading.

One problem is that I have limited access to a machine shop, so I opted to do most of the build using 3-D printed parts.

The end result is a Big Blast reminiscent of Ryan McNumbers rear loading AT3ks





  • 3-D Printer
  • 3" 1/4-20 or 1/4-28 bolt
  • 1/4" washer
  • Nylon insert locknut for the 3" bolt
  • Small strong spring-- I got mine in a spring assortment bag years ago
  • 8 barrels of your choosing 5/8" OD I used some PETG 5/8" OD 1/2" ID CPVC works too, but I would bore it out so it's not so tight
  • Marble-- Mine was from slingshot ammo and the OD is 0.540" so try to get one close to that
  • Spring 9657K286-- I believe that is the part number
  • 1/16" thick neoprene washer-- most hardware stores carry these
  • Super Glue
  • Amazing Goop

GrabCAD Files


Here is the link to the GrabCAD folder. There is a SolidWorks model of the whole turret, and .stl and .step files for the 3-D printed parts.

When you are printing these I found that the holes for the barrels in the base and spacer were not that accurate diameter-wise.

My solution was to print them close and use a 5/8" reamer to do the final sizing.

I would do a test print of the the spacer or part of the base, and then adjust the hole sizes as needed.




Write up


Building this is pretty self explanatory, and the pictures do a pretty good walk through, so I'll let them do most of the explanation.

  • I used 7" barrels, but use whatever you want
  • The turret will fit snugly in the shell, so be careful not to remove too much material.
  • I super glued the barrels in place, but feel free to use whatever glue you want.
  • Print the turret base so the junction to the BBBB tank is down then you should be able to avoid any supports in the internal air passage
  • You can also do any other sort of mods you want i.e. pump relocation, trigger replacement...


For the turret base you will see better performance if you do some after treatment of the print such as a vapor bath. This will seal the layers together well, and prevent leakage from the internal air passage.

I used PLA which is not easy dissolve but I did a vapor treat using tetrahydrofuran. This stuff is nasty, if you aren't trained to work with it DO NOT!!!!

Another safer option is just to paint the internal passages with a durable enamel paint, like nail polish or modeling paints.

For ABS prints acetone is readily available (Nail polish remover) and not as dangerous, but still use caution. You could even just apply it to the internal walls of the air passage using a cotton-swab.





Finished Product




Questions, comments, concerns?

Edited by louiec3, 30 July 2018 - 08:05 PM.

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#2 Daniel Beaver

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Posted 01 August 2018 - 05:10 PM

Sweet build. From where did you source your barrels?

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#3 The lord of fish

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Posted 01 August 2018 - 05:15 PM

+1 on the caution for THF, I use it daily at work and without PPE and handling the fumes alone will fuck you up hardcore.

I may be looking at it wrong, but does it use the opposite barrel as the indexing/locking point? If so that's pretty rad since I've always hated the gear/clutch that regular turrets use(especially the maverick). The painted rearloading slot is slick, really blends in well. 

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#4 louiec3



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Posted 02 August 2018 - 09:14 PM

Half the barrels are clear PETG 9245K25 from McMaster, the 4 with the red stripe are polycarbonate of some kind that I had on hand, but the dimensions are the same. 

The I.D. is about 0.500" +-0.005 compared to CPVC which is closer to 0.484.


Yep the barrel opposite of the firing barrel is where the index is. Its much easier to design than the clutch system, and great for manually operated turrets.

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#5 lelandmodder64



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Posted 04 August 2018 - 04:00 AM

I find PETG at my local microcenter I comes in 1 foot length and has a cpvc type fit for darts

Edited by lelandmodder64, 04 August 2018 - 07:05 AM.

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#6 evilalec555



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Posted 05 August 2018 - 11:43 AM

Dang nerfing is evolving
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#7 sublimedom777



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Posted 08 August 2018 - 12:38 PM

This is fantastic. I love the recessed turret, and there's just something about an 8 shot turret for me.

I wanted to do this same thing to a Lazer Tag Master Blaster, but never got it finished. Of course I was only using a Firefly turret, but still cool
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#8 Pointman9



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Posted 05 November 2018 - 02:42 AM

Any idea of how fast your darts are going?

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#9 ToadBrews



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Posted 06 November 2018 - 02:10 AM

Any chance of you selling or licensing the 3d printed parts? I have a big blast I've been saving and would love to make this but don't have a printer.

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