This is a copy/paste from a Facebook thread by someone else:
“ I have been running my X1-C fairly hard since new so I decided to give it a good birthday. I may have inadvertently found a reason behind the prominent VFA’s that some people are experiencing. The right part is after following BL wiki guidelines, the left print is after I worked through what could have changed since before carrying out maintenance. I am running a few more tests and working on a idea for a jig that could make adjustments simpler for the majority of users. I will release more details when I have that sorted.”
“Brian Dodds I follow the Bl instructions then check the X gantry for square to the Y guide rods. I then loosened one adjuster and added a little more preload until the gantry was square to the guide rods. It didn’t take much.”
“Just a brief walkthrough, I followed the Bl instructions then checked the X gantry for square to the Y guide rods, it was off by 2-3mm. I then loosened one adjuster and added a little more preload until the gantry was square to the guide rods. It didn’t take much.
The belts must be slightly different lengths or haven’t stretched equally because the belt adjusters are in slightly different positions, I would assume this would give different load from the springs which could be causing the issue. If you want to easily see the result of belt tension on the gantry, gently pull or push one belt and you will see one end of the X gantry move.”
