We have a Robo Beta that we recently resurrected from the dead (thanks Mark !). When we tried to print a full size snowflake, we got a layer shift at 40 minutes one time and a layer shift at 20 minutes during a second attempt. The layer shift both times was about 3/4” in the Y direction towards the front of the printer. When we lost steps in the past for whatever reason, the layer shifts were always very small. Nothing like the 3/4” layer shift we are currently randomly experiencing. Is this a symptom of the Y-axis drawer slides that were a “feature” of the Kickstarter Robo’s?