Hitch cover - make your own secure one

Do you want to tow a cool model behind your car instead of that old protective cap you keep loosing? Then this is for you!

The final model will stay in place however bumpy you drive, even a folkrace. It will shatter before falling off, so no carwash…

1. Load the model you want to hollow out and add the Thread4Hole model as a modifier:
   
   
    
2. Add the “Infill” and the “Layers and Perimeters” option by right clicking on the Thread4Hole model.
   
   
    
3. Change all part settings to 0.
   
   
    
4. Drop the Thread4Hole model to the bed by pressing the button to the right of the Position and write down the Z height in the part manipulation window.
   
   
    
5. Position the Thread4Hole model where you want it inside the model. If you want a shorter neck, the tow ball to be towards the bottom, drag the Thread4Hole object down. The maximum you can drag this down is by 33mm for the key to be fully inserted.
   Tip: Set 0 on X and Y to center with the main model.
   
   If the final Z is for example -61.33 then I have dragged it down 16.87mm. (61.33 - 44.46 from above.)
   
   When positioning the height you have to also consider your tow bar neck. If you have a short or oblique neck under the tow ball then you need this shorter than if you have a long straight tow bar neck.
   
   
    
6. Now check the layer preview that there is enough material between the hole and the outer shell of the model you hollow out.
   
7. Happy printing!

The thread lock:

The ThreadLock must be cut by the length you dropped the Thread4Hole model above and wrote down. In my example above, by 16.87mm. Only keep the upper part.

The Key:

You can print one but with two of them together it is easier to align the thread as they support the thread.