Idea: Using NEMA Motors for Belt Calibration on V-Core 4

Hey everyone! 👋 I recently came across this interesting tweet from Josef Průša about their new automated belt tensioning system using NEMA motors to precisely calibrate and test dozens of tension variations: 🔗 https://x.com/josefprusa/status/1940042966527086809 It got me thinking... Could something similar be implemented in the RatRig V-Core 4? As many of you know, calibrating the 4 belts on the V-Core 4 is quite a complex task, especially when it comes to matching tensions accurately across the system. What if we used the drivers from the Z motors — since we already have 3 dedicated Z stepper drivers — and repurposed the spare driver slot on the BTT Octopus to run small NEMA motors acting as belt tensioners? This could allow us to automate or at least streamline the belt tuning process by letting the firmware "try" different tensions and log positional accuracy or backlash, similar to what Prusa's doing. Curious to hear your thoughts: Has anyone explored something like this already? Any reason this wouldn't work with the current RatOS or Klipper setup? Would the hardware complexity be worth the gain in precision? Looking forward to your ideas and opinions! 🚀

Josef Prusa (@josefprusa)

Hello everyone! I have a quick update on the VFA 💡 With our updated automated belt-tension testing printer, we got new default values to tighten the belts to, which we are now testing on hundreds of CORE One printers we have in our company. Together with it we are testing a new

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