Make anything into tire air valve caps you want easily!!

Simply cut a cylinder 8.9mm wide and 11mm tall in whatever you want. Center this piece in that hole and you have instant working tire valve threads. Many of the tire valve prints on here don't work. these are tested and do work. Enjoy..

Print as high quality as you can.. The threads are super fine..
You prob want a brim with these as well set it so there is a 0.1mm gap between the brim and outer layer and it cleans super easy.

Step-by-step instructions: (I know it looks long. I just tend to over explain things). ;)

First I want to say Tinkercad.com has tutorial videos on their site that take about 2 hours to go through them all. After going through those simple videos you'd be surprised what you can make yourself.

-If you make any mistakes along the way you can hit ctrl-z to undo the last step.
-At any-point you can click "D" on the keyboard to "drop" the currently selected model to the work plane. (Fixes a floating piece without painfully trying to manually move it.)

1. Go-to Tinkercad.com, start a new model so you're looking at a blank slate. Change the title of your project in the top left. (Tinkercad automatically comes up with some strange name so just click there and type what you'd like to name your tire caps.

2. In the top right click import and find the "schrader valve threads working.stl" (yeah it's a typo) you downloaded from here. Next you want to import the model you want to cut tire valve threads into. At this point you should see both models on the bed.

3. Next drag over a cylinder from the right on the print bed and you'll see 5 white squares to adjust measurements of the new cylinder. 4 for each of the corners and one for changing the height. (by changing your view either above or below the cylinder changes whether you adjust the height from the top or bottom of the model). While holding "Shift" on your keyboard as you click any of the corner white squares makes any size changes stay proportional with the model. If you don't hold shift as you drag a white box it will only change that axis. Once you click the white square you can also simply then click either of the two text, size boxes that currently say "20.00". Change this to 8.9. Since we were holding shift both boxes should now say "8.9".

4. Now click the 5th white box to change the height to 11mm. On the right side of the work-plane you'll see settings for the cylinder. You'll notice the cylinder currently has 24 sides. We want to round that up by sliding the bar all the way to the right making the cylinder much smoother.

5. Above those same settings you'll see the ability to be able to make the cylinder a "hole". This option makes it so that when grouping a "hole" model with another model acutually cuts material away instead of adding material. We want to cut out a hole so.. Make the cylinder a hole and then drag it "into" the model where you want the treads to be cut in. (Read step 7 to get some alignment tips). Once the cylider is where the threads are going to be cut in, hold shift an click on the model so both pieces are selected. Alternatively you can click outside the models and drag a box selecting both the cylinder and the model you want to cut treads into. Be careful that the schrader valve model is not accidentally selected too in the background.

6. Once both models are selected (the model as a solid and the cylinder as a hole) we want to "group" them together by clicking the "Group" button next to the light bulb or by hitting ctrl-G on the keyboard. You should now have a hole 8.9mm round and 11mm high in the bottom of your model.

7. Now just simply drag the schrader valve model into the middle of that hole. We are going to "group" these two pieces both as solids but turning the schrader valve to "hole" temporarily helps with alignment. (If your model is proportional you can auto align centers by selecting both pieces again and clicking "L" on the keyboard. This will bring up little alignment tabs you can click on to center the pieces together).

8. Finally, once you are sure all outer sides of the schrader valve model are touching with the model we can group them again. with ctrl-g. Again both pieces this time are solid. You can now click "export" to save your new *.stl file to your computer where you can open with you fav slicer and print away!! Be sure you drop me some love on my page. Thanks