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.