Fix X belt rubbing on idler pulley
The more I print the more the x belt rubs on the idler pulley, new x parts doesn't change anything.
To understand what's realy happens, I replace the idler pulley with a 20 touth alloy pulley on witch I remove the flanges to free the lateral belt positioning, when moving the x carriage to the left the belt goes directly against the x end body, see video before http://dl.free.fr/f8V5yuORA .
The reason for this is the idler axis bad design, while the axle is strongly maintained in place by the nut stucked in is slot at the rear, on the opposite, the axle is free and hardly pulled forwards by the belt and it makes the axle and pulley to go wrong and forces the belt to slides on it.
I noticed also that the front pulley axis hole was larger compared to the rear, this will increase the symptom.
To solve this I enlarge the rear hole and the nut slot to make some room for the axle assembly, see video after http://dl.free.fr/bQVipFf42 .
This is only a quick-fix, I'm thinking to redesign the x end body, but we reach the limit of printed plastic part for such an assembly which requires high precision.
MK4/MMU3 - VORON 2.4 350 Stealthburner
Re: Fix X belt rubbing on idler pulley
I agree about the ??? in locating a guide device. I printed the R2 parts with the bolt hole enlarged to 5mm. I bought some dual brg pullys. The brgs didn't touch each other so i made an arbor to press them deeper into the pully so the inner races contacted each other. Then i made some crush tubes to support the through bolt. This allowed me to lock down the center race of the brgs and center it in the support. My belt runs true.