Dial indicator holder that fits in the TAZ's Budaschnozzle slot. Nice and solid, less subjective bed leveling than I can do with a piece of paper as a feeler gauge.
I printed on a TAZ 4.1 in PLA using the default medium settings. ABS would have been better.
When using while the printer is powered on, the TAZ wants at least the thermistor connected. Probably easier to home the printer, power off, remove the Budaschnozzle, insert the indicator, and move the x and y axes by hand.