RRC
Rat Rig Community [Unofficial]•2mo ago
rms497

VAOC Calibrated, But Totally Off Next Time Tool Runs

(This is on a 500) Been reading about the VAOC issues here and not sure my problem fits exactly into the more recent discussions, wondering if anyone would have guidance -- I can run through a VAOC calibration, everything looks good but when I do a multi color print, no good, x offset is quite large. >3-4mm. In trying to understand further, if I do a complete VAOC calibration and save, go back and home the machine, do a z-tilt, if i go back to a VAOC calibration, everything is way off. So it's not that it appears to be calibrated and it's printing incorrectly, it seems like my calibrations get out of whack basically as soon as it's saved. I've validated all screws are tightened, and belts are maybe a little loose but seem in accpetable range. when homed, bottom belts at 105hz and top belts at 98hz. Both sides are at same frequency. Only thing I am not sure on belts is length. All 4 are same length, but Im unsure how that all plays into how much belt is after each clip. If you follow what Im saying do I need to have the exact same number of teeth after the clips (in each toolhead) and I guess on either side of the mouting block for the hybrid belts? That Im not exactly mirrored, could that be an issue? Any guidance on best troublehshooting steps? Comissioning guide really doesnt have much for troubleshooting there. I'll say the x offset in my ratos-vars is perfectly within the values mentioned I should have: 
idex_applied_offset = 0
idex_xcontrolpoint = 212.1980545886675
idex_xoffset = 0.07108125106864804
idex_ycontrolpoint = 525.8256643003863
idex_yoffset = -0.3824471495563557
idex_zcontrolpoint = -0.2948406250028259
idex_zoffset = -0.025159374997174577
idex_zoffsetcontrolpoint = -2.725862499884027
nozzle_expansion_applied_offset = 0
nozzle_expansion_coefficient_multiplier = 1.0
nozzle_expansion_coefficient_t0 = 0.052393750006730855
nozzle_expansion_coefficient_t1 = 0.06588125000502831
t0_filament = ('', '', 0)
t1_filament = ('', '', 0)
idex_applied_offset = 0
idex_xcontrolpoint = 212.1980545886675
idex_xoffset = 0.07108125106864804
idex_ycontrolpoint = 525.8256643003863
idex_yoffset = -0.3824471495563557
idex_zcontrolpoint = -0.2948406250028259
idex_zoffset = -0.025159374997174577
idex_zoffsetcontrolpoint = -2.725862499884027
nozzle_expansion_applied_offset = 0
nozzle_expansion_coefficient_multiplier = 1.0
nozzle_expansion_coefficient_t0 = 0.052393750006730855
nozzle_expansion_coefficient_t1 = 0.06588125000502831
t0_filament = ('', '', 0)
t1_filament = ('', '', 0)
5 Replies
rms497
rms497OP•2mo ago
Also to add there I've done a compelte thermal expansion calibration and the Z offset calibration. After fixing the Chube hoteds, Z offset is correct and within good range (0.03)
rms497
rms497OP•2mo ago
An example -- I have completely calibrated / aligned in VAOC and then just went back in. This is the intial view of T0 nad T1. I guess the misalignment seems almost exactly the same so I feel like that is saying somehting easy, But Im unsure what that is.
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MDFPereira
MDFPereira•2w ago
Did you run the CALCULATE_DC_ENDSTOP command during the commissioning guide?
rms497
rms497OP•2w ago
Yessir 🙂 I have followed, to a T, the commisisoning guide. I ended up discovering a mechanical issue yesterday during a print with the largest object I've attempted to date. Ended up having to completely unmount the left hybrid motor and belt, fixed and remounted. Im hoping I have better luck after this 🙂
billyd
billyd•2w ago
On the idex the belt tensions and length have to be precisely correct to operate well. Also the frame and gantry must be made perfectly square. I suggest going to printables.com and searching for "gravity assisted tensioning system" and follow the instructions on that page very carefully.

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