I get errors if I try to `Printout3D[ ]`

or `Export[ ]`

to an `.stl`

file an object containing either an ellipsoid or prisms with any complexity. For example, neither:

```
testError = Graphics3D[{Tube[{{0, 0, 0}, {1, 1, 1}}, .1],
Ellipsoid[{1, 1, .5}, {1, 1, .1}]}]
```

… nor

```
pos=20; top=.9; bottom=.1
testError=Graphics3D[
Table[Prism[{{0, 0, top}, {1.2 Cos@x, 1.2 Sin@x,top},
{1.2 Cos[x + 2 Pi/pos], 1.2 Sin[x + 2 Pi/pos], top}, {0, 0, bottom}, {1.2 Cos@x, 1.2 Sin@x,bottom}, {1.2 Cos[x + 2 Pi/pos], 1.2 Sin[x + 2 Pi/pos],bottom}}],
{x, 0, 2 [Pi] - 2 [Pi]/pos, 5 2 [Pi]/pos}]]
```

… produce the expected results with either `Export["test.stl",testError]`

or `Pintout3D[testError,"test.stl"]`

. What am I doing wrong? Using 12.1.