Just what i needed but the wrong size, so i remixed it in Tinkercad to fit an 18mm hole. This is rally easy to do even if you haven't used Tinkercad before and is free to use.

Measure the hole the stake needs to fit into, if you cant do it precisely best effort is OK but you made need to do several iterations of tweaking to get it to fit snugly.

Launch Tinkercad and create a cylinder the diameter of the hole you just measured. Import the stake stl that you want to resize and line the both up end to end.

Then use the Align tool in Tinercad to align them both centrally (see picture with red arrows). This will give you a visual of how larger or smaller you need to make the stake as the diameter of the blunt end needs to make that of your cylinder

Select the stake and then select one of the diameter gadgets(boxes) that appear on the selected item (see picture with green arrow).

Whilst holding down the SHIFT key left-click and drag the box to make the part larger or smaller to match your cylinder - whilst always keeping the SHIFT key pressed. This make the entire object rescale rather than just one dimension.

Once you have it close select both objects and use the Align tool to re-align them so you can see if you need more adjustments. If you do simply repeat the steps above until you get a good match.

Then export and print the part, do a test fit to see if you are good or need to tweak it. If you need to tweak simply repeat the above steps.

May seem daunting if you haven't done this before but it's so easy and very useful

Hope that helps someone

Print Settings

Resolution:

0.2

Infill: 

20%

Notes:

Printed in the orientation you see in the picture to maximize strength

Category: Outdoor & Garden