1. Printed Vats Invalid
   To recreate:
   Build any valid vat, save it in a schematic then print it.
   The printed controller will show the invalid message, and right-clicking it helps nothing.
   The printed vat side blocks are recognized as destroy:vat_side, and only replacing all of them will the vat be formed.
   It seems that the controller doesn't treat vat_side as a vat material.
   If printing it using the schematicannon, vat_side blocks will not be printed at all.
2. Vat Side Blocks Drops Nothing
   When breaking a vat block with proper tools in survival mode, it drops nothing.
   However, once a vat block is broken, the vat structure is destroyed, the remaining parts will become their origin blocks and can be broken normally.
   By the way, I suggest that vat blocks and controllers can be dismantled by wrenching as other machines.
3. Vat Temperature Changes Discontinuously
   When heating or cooling a vat, its temperature floats in a range and jumps from the maximum to the minimun. This makes it extremely hard to control the temperature precisely.
4. Controllers cannot Rotate
   Controllers have the facing data but can't be rotated by wrenching. And when printing a controller in a schematic, it always faces the origin direction even if you have rotated the schematic.

1, 2 and 4 have been fixed in 0.4. For 3, what do you have in your Vat? @helloworld069

Closing due to lack of a response. Open a new report if the issue persists.