Belt tensioner/idlers mount

21.02.2018: Added V2 of the tensioner part (the green one). This has spacers builtin that only touch the inner ring of the iddlers bearings. I printed and installed this and it works as intended. The guide part also has V2 with the same builtin spacers but I had not printed and installed this. Should work though.

I wanted to fit toothed idlers and also add belt tensioner but did not like other designs ( too bulky, more extra parts, longer printing times,...) so I designed and printed this.
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