I have recently started going through some of my dad's old slides from his tour in the Navy in the late 60s. My intent was to scan and color-correct the slides, but 45 years in storage has left the slides covered in a large amount of dust. I'd rather not wipe the dust off and risk scratching or damaging the slides, because there is already enough cleanup work to do. So, i came up with this vacuum cleaning device.
The base holds 20 slides, and the top is designed for the 1.25 inch hose from a 1-gallon Shop-Vac. I tried using a hand vac as well, but there wasn't enough suction. Once you turn on the vacuum, you should see the slides lift up about 1cm in the box. If the slides don't lift, give the box a gentle shake, or put your hand on the bottom to restrict airflow a bit. Once the slides are floating, let the vacuum run for about 20-30 seconds.
Then end result is slides that are 80-90% cleaner. Some dust will still be present, but it vastly reduced the amount of dust on the slides I tested it with. A good majority of the slides I looked at were usable without further cleanup.
Print the base at 100% infill and .25 layer height. Be sure that your print surface is flat and well-prepared, as the printed mesh on the bottom of the slide box is very fragile when the first layer is going down.
The top should be printed at 100% infill and .25 layer height as well. No supports are needed for either part. I used PLA for stiffness and dimensional accuracy. The top and bottom are a decently tight fit, so a properly-tuned printer will help.