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Great Prints regardless of humidty

Discussion in 'Mods and Upgrades' started by Lance Weston, Jul 14, 2019.

  1. Lance Weston

    Lance Weston Member

    Jun 2, 2018
    Likes Received:
    My basement is 60% humidity in the summer with the dehumidifier running full blast. I could not make decent prints. I purchased a couple of aluminum air tight army surplus boxes with purge valves. I removed the purge valves, tapped the boxes for 1/2 NPT. Using the rubber washer from the purge valve and Blue Block sealant I installed a valve and a hose adapter. I added desiccant. I had an old vane vacuum pump laying around and sucked the air out of boxes. My prints were better but not perfect.

    Desiccant is designed to bring the moisture down to 25%-35% RH. This is only good for 8 hours of printing before I notice degradation.

    I then baked all of the plastic for 3 hours at 150F before putting into the box and 1 1/2 hour at 150F (in a convection oven/microwave) right before use. Even the least expensive plastic gives very nice prints. The 28" of vacuum is not enough to boil the water out of the plastic and probably just the sealed case is enough. This was good for 24 hours of printing before degradation.

    I am now able to print out all of the partial rolls that I thought were junk.

    Moisture seems to be the root of all printing problems.

    I just ordered a deep vacuum pump for $12 from eBay. A deep vacuum should boil out the moisture with no heat required.

    The case: http://armysurpluswarehouse.com/mil...rized-case-night-vision-goggles-storage-case/

    ball valve:

    hose fitting:

    vacuum pump:

    Attached Files:

    mark tomlinson likes this.
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Feb 21, 2013
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    I keep mine stored with desiccant until it goes on the spool for printing, but even then we had to use a dehumidifier to drop the RH down to 45% or so for it to be a workable environment. :)

    Good job!
    Geof likes this.

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