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You are probably already familiar with the PVC pipe marshmallow shooter, a classic, fun weekend project. Maybe you already have one. Next time you show up for some gooey, air-powered confectionary warfare, why not come packing some classy heat — the Deluxe Copper Mini Marshmallow Shooter Mk. II!

You’ll build it from lengths of copper pipe and standard fittings. The Dremel Multi-Max will cut your 1/2″ dia. pipe to length with ease, so no more laboring over a hacksaw. Finally, you’ll need some basic pipe soldering skills to put it all together.



Dremel Multi-Max oscillating tool and 3/4″ wood/metal flush cut blade. You could also use the Multi-Max MM462 Wood-Metal flush cut blade (1 1/8″ wide).
Copper plumbing pipe (1) 2′ length of 1/2″ internal diameter
1/2″ copper pipe elbows (2)
1/2″ copper end caps (2)
1/2″ copper T joints (2)
Metal files
Bench vise
Propane torch
Lead-free pipe solder and flux
Emery paper
Safety goggles

Threaded copper 1/2″ MIP adapter (1), and threaded copper 1/2″ female adapter (1) for unscrewing the barrel
Tape or a latex glove tip for protecting the mouth piece

MAKE_DownloadPDF_icon.gifDownload the Project PDF
(Right click to save the PDF to your desktop.)



  1. mcsteve says:

    A Dremel Multi-Max? Not to be too critical; I know Make: has to make money, but this is kinda ridiculous.

    “The Dremel Multi-Max will cut your ½” dia. pipe to length with ease, so no more laboring over a hacksaw.”

    Isn’t that a bit like slicing up tinfoil with a plasma cutter? Who uses a hacksaw to cut copper pipe anyway? A pipe cutter works better than a hacksaw, and probably better than a Multi-Max, and costs much much less. No vice required, either…

    Don’t get be wrong, I am a huge fan of Make:, and of Dremel, but come on; you’re doing it wrong!

    1. Simon says:

      I use a hacksaw to cut 1/2 in copper pipe. Was doing so last night in fact :)

      But yes, my first thought on reading the summary was you must be REALLY unfit if you need to labour over cutting 1/2 inch copper with a hacksaw.

      30mm diameter solid steel stock, now that keeps you busy!

      Oh, also you should include something in the PDF about washing everything out after soldering. I don’t know what flux you’re using with the lead free solder but if someone gets that wrong and uses the wrong kind it could be a very nasty thing to be sucking on! Most flux is nasty, nasty stuff.

    2. John Park says:

      Hi Mcsteve, I hear you, and get your point. However, I did go for the possible overkill of using the Multi-Max to cut the pipe and it worked great and was really satisfying to buzz through. You’re dead right that a pipe cutter is an inexpensive tool that’s perfect for the job, but in the Alton Brown vernacular, it’s a uni-tasker. If you happen to have a Multi-Max in your bag of tricks, you’ll start to use it for a zillion different things around the shop and house. I don’t have a pipe cutter, but I found that having the Multi-Max let me go for the project anyway, and the results were great.

  2. Check out this great video:
    Do it yourself: build a marshmallow gun that shoots 80 mph
    Find the plans at “”