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I have a RMaxV2 shipped from Jan 2015. This week I decided to update from the U-joint arms and melamine carriages to the ball cup arms and the injection molded carriages after a few failed prints of large diameter objects. The old U-joint arms were binding/rubbing my part layer fans when they were at some large radius distances from the center of the bed.

I am in the process of recalibrating the machine and updating the Rambo firmware. There is a discrepancy between the installation instructions and the latest firmware on Github. What values should I use?

Because of this, you'll need to recalibrate. In order to do this successfully, you'll need to change your Horizontal Radius to 140 (if you haven't already) and the Diagonal Rod length to 290.8.

From: https://seemecnc.dozuki.com/Guide/Insta ... 0-15%29/26
From: https://github.com/seemecnc/Firmware/bl ... guration.h

In a few weeks I also plan on adding an FSR kit under the heated bed. When I do that, do I have to compensate for the raised height by reducing this parameter or can I just leave it alone? Thanks in advance!

I uploaded the firmware only configuring my printer (not changing the values in the printer definition section) and the printer LCD screen under calibration says

H. Radius: 143.28mm

I'm presuming this is a calculated value, since I cant find this value anywhere in the firmware configuration.h file.

So at this moment I'm looking to figure out if either of these sets of values is correct: 143.28 vs 140 mm for horizontal rod radius and 291.06 vs 290.8.

Contact support to see how long your arms are - there was a small change at some point.

g.