This compact humidifying element will occupy minimal space in your humidor, allowing you to fill your humidor with more important stuff.
** FINAL STEP UPDATED **
Step 1: Gather Materials
To make your own compact humidifying element, you will need the following:
-- propylene glycol crystals
(I get mine from Cigars International, but other online cigar stores stock them)
-- an empty aluminum cigar tube
-- 1/8 " drill bit and drill
-- center punch
Step 2: Strip the Tube
I sanded all of the paint off of the cigar tube for aesthetic purposes, but this step is optional.
Step 3: Prep and Drill
Mark the tube with the punch in 1/4" intervals along a straight line, then drill.
Step 4: Finish and Fill
I squished the rather malleable tube in a couple places while I was handling it, so I used a smaller cigar tube to pop out the dents. After you are satisfied with the tube's condition, fill it with propylene glycol gel.
Step 5: Put It to Use
Cap the tube and set it in your humidor. Admire the vast new space made available to you for cigar storage.
** UPDATE **
After a little more than a month of use, I determined that my humidifier was registering consistently low hygrometer readings, despite rehydrating the gel a few times.
To solve this, I drilled a large number of additional holes (on all sides) to allow for better air circulation and evaporation. It works -- keeps my humidor interior within the requisite 66 - 79% humidity zone.
Below is the finished product.