This is a guide to making adjustments and edits to 3D models made with the 3D pony creator guide: https://www.brohoof....or-3d-printing/
This tutorial will go through the ends and outs of Meshmixer and how to use each component to edit your model into exactly what you want.
So I will assume that you are starting out with your .obj assortment from pony lumen and have it opened in Meshmixer like so:

To begin all most all of the controls are on the left panel. One at a time through the panel menu:
Meshmix
allows you to add generic shapes to the model, which maybe useful for bases, or perhaps making a new object for your pony.
Select
This allows you to select sections of your model, very useful for removing sections of models, such as unwanted sections of tail or mane, There are two different modes to this feature, one is a paint brush that appears as a an orange circle, this can be slid over the model to select areas of the surface to delete. However this will only remove the selected surface elements, to completely slice the model you can use the red line to outline a polygon in the direction of your desired cut. This should slice completely through the object. The red line can be used by left clicking outside the selected model, the surface scan you have to hold over the currently selected model then left click and hold to select an area in a brush like manner.
Sculpt
This allows you to change the mesh shape and is of particular use for pony editing. There are a variety of different brushes

The primary ones I use are Drag, Flatten, Inflate, Pinch, Bubble Smooth, and Shrink Smooth
Drag moves the mesh in the direction, much as if you had a pin that you used to move a particular spot around. Useful for making dents in objects before smoothing them together.
Flatten is exactly what it sounds like, makes a section of mesh flatter, not quite as useful as smooth, but has it's moments
Inflate bulges up a section, good if you need to make a something a little bigger or add a protrusion to an object.
Pinch makes mesh flow towards a point, great for making points and cones or sharpening an inflation. Be careful as it is easy to lean the pinch to one side. The best method I know it to turn the camera to face exactly behind where your drawing the point towards
Bubble Smooth smooths the model while taking reference to bulge dips to form more rounded shapes.
Shrink Smooth is just like bubble smooth but instead gives preference to the dips and pulls the heights down.
Here is an example of a few edits I made to the default pony model from pony lumen:

Sculpting takes awhile and I did this pretty quickly, so it's very rough, but just an illustration.
Stamp
I have no idea what this does. I have never used it.
Edit
This is the core of the editor. When you click it you get this little menu:

Transform
This function contains the commands for moving the model, including translation rotation and scaling. Scaling will become important for determining the final size.
Plane Cut
This makes a great function for splitting an object along a plane. The big blue arrow near the center changes the direction of the cut.
Make Solid
This can repair the object if it has any holes in it by making the object solid It will tend to slightly change the object by rounding square corners, but this will usually make the object stronger.
Analysis
Under this heading you will find an option for Units/Dimensions this is very important as it will allow you to pick the size of your object. I recommend doing all measurements in mm because most all 3D printers use mm as a base unit. Do any conversions outside Meshmixer. Sometimes if you convert to inches in meshmixer and then back to mm, the output file will still mess up. So use an outside converter and then type in the number of mm you want a particular access to be. The other two axes will scale themselves automatically.
That's it for a quick guide through meshmixer, if you have any additional questions please feel free to send me a message.
Thank you for reading,
Trotsky the Hell Steed



