Multiple STL Import Issues

[Anonymous]

I am a new user, I am about to purchase an Anycubic Photon so I could make detail parts for my model railroad layout.

I was told by a friend that Mesh Mixer was the best way to edit STL files.

I have downloaded several files from Thingiverse.

I wanted to merge several STL files into one file for printing.

I started out with 9 tree stumps. But after importing them and setting them all to Y=1 mm, I looked at the "Front" perspective and saw this:

I highlighted the printer bed line in red. The two issues are, first with Y set all to 1, why are the stumps not all on the same level? And two, why all the all below the printer bed?

I then tried to save the project as an STL file and got the following error.:

My question is twofold, how can I tell which stump is "Complex" and how can I change that stump so it will save properly?

Thanking you in advance for your help.

--

Will Annand

[Anonymous · Accepted solution]

MM imports objects oriented as they are. If there are vertices with Y coordinates below zero in the file MM loads those vertices below the Y-zero plane (the printer bed). MM doesn't do an alignment to the bed automatically. You need to do something like

EDIT/Align with Source=BasePoint and Destination WorldOrigin/Y-up (on a single object)

or

ANALYSIS/LayoutPacking (for several objects)

to move the objects to the bed.

Guess you tried to use ANALYSIS/UnitsDimension to scale the stumps to a height of 1?

This tool is global scaling. Means the height of the bounding box of ALL objects is set (to e.g. 1) while keeping the size ratio of several objects.

If you want to scale each object independently you need to run EDIT/Transform on it. There you can input a desired Y value clicking on  and editing the SizeY value. If you want proportional scaling of all its dimensions enable UniformScaling before setting a target value.

The Complex warning on Export is due to some mesh error (non manifold faces). This error might result in a later printing fail. MM highlights such issues by red lines (think I see such a red line on the root of the left small stump). You should run ANALYSIS/Inspector to fix such errors.