UM3 Auto Leveling Not Working in Help, Tips & Tricks Posted March 18 We change buildplates nearly daily. We have a dozen spare glass buildplates, precoated, so we can quick swap. Hence why we spent a fortune on the UM3's, quite a few of them, because of reliability. Might grab one or two S5's but unsure. UM3's are nice, but i have not been impressed with the aftersale customer service. It seems those machines are hit/miss, might get a really good one or a really shitty one. Although in all fairness... i think that was a first/second batch issue, which is understandable.