According to my analysis of the STL the clamps have the same offset, fitting to the core. You should update these as well.
yes everything is being updated
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Ryan @vicious1 mentioned in the PRIMO-thread that the modified clamps can be used (as several has reported) to counter the offset error(New MPCNC for 2020! - Primo -). I will go for this solution, since I’m all out of the fancy pantsy PLA I bought for the occation. Has anyone here attempted to make a modified Y clamp as well? Or is it possible to use the modified clamp for the Y-spot as well?
Edit: I see from the build doc that it seems like a regular clamp can be used, but then the truck wouldn’t clear. I guess this is the reason for loosing 15mm of workspace? Would the workspace be identical if a Y-clamp repair came?
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Did you use a separate Y-clamp, or did you use this one for all the four mounts? How has it worked out?
Here is a modified version of the y clamp remixed from https://www.thingiverse.com/thing:4564508
I’ve tested it on my core with the incorrect hole spacing and it can be adjusted to remove all the wobble.
Enjoy!
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Perfect, thanks! I will print and assemble the coming days, I’ll let you know how it goes.
Neat, that came right on time. I just printed the first two clamps and thought about sawing that piece off. 
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I had some time and installed the two that had been already printed on the Y-axis. It’s incredible, no more wiggling. I thought mine were installed pretty well. Oh boy was I wrong. I can only imagine how much more precise it is going to be after toolchanges when I install the second set this evening.
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I’m printing the makeshift clamps right now, and finish assembling the core tonight. Good timing, I’m excited!
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Squaring took me 30 seconds for the 4mm offset that I was constantly having.
Last time I tried for over 2 hours. -_-
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Shoot - I was hoping to finish the gantry tonight, but only got to the trucks and tops. Well well, more fun another night
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Finished the core, everything is perfectly square. No loose bearings anywhere. What a relief! I never figured the burly out, the end stops did the job. Now it was a breeze, the frame, trucks, core and rails again. I used the modified clamps, as mentioned earlier, since I didn’t have filament for a new core.
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