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z axes synchrony and first layer problem (2 replies)

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hello,
last week i got my new mendel90. i really enjoyed putting it together, it is a very nice kit. some weeks before i assembled ikea furniture and with many details you could see how they just want to make everything cheap and max profit, regardless of durability and function. so it was just a pleasure to have exactly the opposite from a very small company, thanks nophead!

however i still have a problem with the synchrony of the z axes motors. i put the flags to the threaded rod and i can see that they get 180° apart with homeing z. i did put grease on the rods and refixed the screws. i followed exactly the manual i suppose.
anybody any suggestions?
i was already printing fine, when today i tried to print a lithophane. i attach a picture what happend tothe first few layers, all wrinkels like my shirt ;-)
i printed pla from grrf at 206°, 60° bed.

thanks,
michael

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