I am no expert, but I think the spindle unit looks legit for hobby use. Seems like the runout mostly derives from the tool holders. I bought the cheapest I could find. More measurements and test milling will come. Hope u enjoyed the video. Affiliate link to cheap er32 BT30 tool holder: https://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_id=114&ipn=icep&toolid=20004&campid=5338593796&mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2FBT30-ER32-70-M12-CNC-Milling-Chuck-Holder-Milling-Workholding%2F291781141893%3FssPageName%3DSTRK%253AMEBIDX%253AIT%26_trksid%3Dp2057872.m2749.l2649