October 23, 2025

Harbor Freight Avanti Paint Sprayer Cup Lid

STL’s for this project are available for purchase from Cults3d.com

This was just a quick project to make a lid for the cheap Avanti Paint Sprayer that Harbor Freight sells to make it easier to use and clean.

These cheap AV-100 Avanti Paint Sprayers can be bought for around $40 (on sale) from Harbor Freight and while they work great for simple spray jobs they only come with one cup and no lid. I found out spraying thin coats on some interior doors that if you wait to long in between coats the paint will dry and clog the nozzle.  I figured with the help of a little 3D printing I could make a lid for the cup so I can remove the cup and clean the sprayer in between coats.

The Lid design was pretty basic and easy to print and fits the cup well enough.

The threads are the only tricky part of the design but still very easy to copy from the sprayer itself.  Now while Harbor Freight doesn’t sell any kind of lid they do sell extra cups but not in store. I didn’t feel like waiting to order an extra cup so while I was at it I also designed an adapter that fits the sprayer that allows me to use a different container to spray water thought the spray to clean it out while the first paint coat dries.

I ended up just using a 40 oz Skippy Peanut Butter container that I had laying around.

The adapter screws right onto the peanut butter jar and then it can attach to the sprayer for cleaning.

The only downsides are the peanut butter jar is much taller so the pickup suction tube doesn’t go all the way to the bottom and you can not stand up the Sprayer and let it sit on your bench like you can with the original cup.  Those issues don’t bother me because I’m only spraying water through it to clean and then taking it right back off to clean the rest of the sprayer.  (I would not try to spray paint or stain through this container or it might make a mess as it’s probably not a perfect air tight seal with the 3D printed adapter.)  Overall the parts worked great for me and I even left stain in the cup with the lid on for a week and everything was fine to continue painting the next weekend.

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