interestingly cracked perpendicularly to the layer lines. most likely a combo of the general tension on the belts + the moisture and heat fluctuations in the enclosed trailer I have it setup in. I can get swings of 20 degrees and 40-50% humidity on different days even with insulation and portable AC to try to keep the heat and moisture down in there. time to up the walls and infill. looks like i originally printed these with a .6 nozzle but only 20% cubic infill on a crappy printer. just happy it didn’t happen while a job was running.
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Interesting crack direction.
Don’t know if this helps, but shared modded LR3 belt holders at https://www.printables.com/model/425515-v1e-lowrider-3-mid-belt-y-tensioner-block/comments they require additional bolt through them to hold clam parts together.
looking at it a bit deeper, it looks exactly like where it would fail from over tensioning being the thinner part of the belt channel is what blew out.
Most likely, the moisture and heat fluctuations added to how brittle it became and then second to last job, I noticed the belts were a bit loose after sitting for 6 months, so i tensioned and ran a job and then now after another few weeks of sitting and recent weather drop seems to be enough to finish it off.
I wonder if PET-CF or PET-GF would be a better material choice for these parts or abs/asa-gf and what the creep might be over time.
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I guess it’s time for an upgrade to the 4, no use printing that one part. 
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Worth printing stock PLA with more walls, more infill, more top/bottom layers? Replacements will hopefully last long enough until LR5 is designed and released? Nice that the PLA cracked rather than silently creep and stretch.
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lol was literally thinking about that, but i’ll wait. I do want to eventually rebuild, but not in the mood for that ATM.
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Yeah, for now, I’m just going to print in PLA with 5 walls and 60% gyroid infill. and 6 top/bottom layers. But def will consider some pet-gf or pctg-gf for some of these parts on a future build. Currently this machine is only 24”x ~60”, I’d like to go a bit larger in the future
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