The purpose of reducing the 1/2" conduit to a 1/4" is the increase the pressure of the air you are blowing into the embers.
My initial prototype was meant for use at home, so I had no need to make it more compact for travel. I took the full-size version camping and decided I needed to make another that could be packed into our camping tubs.
Depending on if you decide the include the option to break it down, you cost should range from around $8-12 (ish)
Step 1: Gathering the Parts & Tools
(1) 1/2" x 5' conduit
(1) Bag of 1/2" compression connectors with insulated throat (you'll remove the insulation fcor this)...at my store I couldn't buy singles of these and I might make another one or two for friends
(1) Bag of 1/2" set-screw couplings (same story...needed two, might make multiples...bought a bag) *optional*
(1) 1/4" x 3" pipe segment (not sure what they called it
(1) 1/2" x 1/4" coupling reducer
TOOLS: (only needed if you are taking the option to make this segmented to break down for easier packing)
• Something to cut the conduit with. I used a hacksaw; a cut-off wheel on a rotary tool, such as a Dremmel, would work as well
• Something to de-burr the cut end of the pipe with (sandpaper, grinding wheel, Dremmel grinding head, etc.)
• Screwdriver (phillips or flat head)
Step 2: Initial Assembly
Step 3: Cutting and Segmenting
Step 4: Final Thoughts
I also need to make a stand to keep this upright (out of the way)...I haven't gotten around to building it yet, but my plans are for a pvc pipe about 18" long that this will fit into, with angle brackets attached at the bottom for tent stakes or nails to be driven through.