Not shop STL Print issues - HELP?

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I downloaded a bunch of items from the Not shop and sent them to craftCloud for printing - they have responded with the following message and images below:
PS, I have not modified any of the STL files (**Button+Pusher±+3D,
Dust+Hose+1.25, Triangle+Anchor±+3, Belt+Guard) - print settings **
Material — SLS Nylon PA12 (SLS) - Finish — Shot Peened - Colour — Dyed Black

Any pointers?

Reply:
”*After reviewing your order, we found the following issues:
The walls of your model are not thick enough. This may lead to fragile parts breaking during printing and/or shipment (please find a picture attached). We recommend a minimum wall thickness of 1.0MM.

It’s our goal to help you get your order printed with satisfactory results, which is why we would happily process the order if you send us a revised model in reply to this message. If you are aware of the issue mentioned already and you are willing to accept the predicted results, we will proceed with the order accordingly.

If you need help editing your file, we can recommend the following article by All3DP”*

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11946×1165 113 KB

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Hey! a bit late to your reply but craft cloud is correct. The belt guard STL file is not good for 3D printing. I’m having the same issues, especially on the belt guard. I have my own 3d Printer and the print just does not work.

My guess is the original part was designed for injection molding, and then the file was saved/shared as an STL for 3D printing (without validating the change in manufacturing process.)

That thin bridge in red is essential for keeping the belt from getting caught in the gears. I was a bit careless during calibration and didn’t provide tension on my lines and it got caught. The belt was ruined and so was the guard. The replacement print doesn’t work, so I think I’ll order a new OEM part instead.

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thanks - thought it was just me