Mason Jar PVA Slurry Brush Cap

Print in TPU and combine with a 3/8" handle diameter foam brush for a self-sealing lid/brush combo to apply IPA-diluted PVA to your build plate.

I know that using PVA is a bit passé and everyone on Reddit will tell you that you don't need PVA, you just need to "get gud, noob," but I print a lot of material/buildplate combos that benefit from using PVA as a release agent.  Most of these can benefit most when the PVA is as thin as possible such as writeable TPU cable tags on smooth PEI, PA on G10, and PET-CF on textured PEI.

In order to make my PVA layers as thin as possible, I previously used glue stick and thinned/wiped it with a lint-free rag dampened with IPA.  This usually worked great, but I would occasionally miss spots, leading to TPU fusing with smooth PEI or PET fusing with textured PEI and either ruin a buildplate or buy me into several hours of meticulous scraping.

A few months back, I was turned onto "PVA slurry" by a friend who exclusively prints PA on G10 and I started using that, but I'm lazy and didn't like having to spend 5-10 minutes running my brush under hot water every time I coated the build plate.  So, I designed this. 

The slurry recipe I typically use is 40% PVA, 50% IPA, 10% distilled water.  All measurements are by volume.  If you need a thinner mix, use more IPA, and if you need a thicker mix, cut the amount of water in half prior to reducing the amount of IPA.