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Printrbot Talk Forum • View topic - comparing XL belts to GT2 belts

comparing XL belts to GT2 belts

Talk about modifications to the printer

comparing XL belts to GT2 belts

Postby halley » 2013-Feb-Wed-19-Feb

I upgraded from stock XL belts and filament-printed pulleys, to GT2 belts and aluminum 20t pulleys.

The two models below were printed with identical gcode files. The only difference was my upgrading to new belts and gears, and using M92 code to recalibrate for size.

Image

Closer views in the album view.
http://imgur.com/a/0CnUd
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halley
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comparing XL belts to GT2 belts

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Re: comparing XL belts to GT2 belts

Postby milrtime83 » 2013-Feb-Thu-09-Feb

Noticeably difference, but you aren't just comparing XL vs GT2 belts. A machined pulley instead of a printed one for your XL belt would also eliminate most of the backlash you were getting.
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Re: comparing XL belts to GT2 belts

Postby halley » 2013-Feb-Thu-10-Feb

Definitely, backlash is a part of it. I just didn't have room to give a longer title to the post.

The ideal timing belt has no stretch at all, but that's impractical or impossible to make. The XL belts feel stretchier than the GT2, so it was harder to keep all slack out of the system. I adjusted tension on every print, to the point that motors were starting to strain, and would find slack at the end.

To your point, the metal pulleys are a world of difference. If you overtighten the ABS pulleys, they will crack and stretch. Even if you don't overtighten them, the copies I had were off-center/non-round, so that radius variation would subtly throw off the consistency in carriage distance at different parts of the bed. The metal pulleys were round, regular and most of all, able to clamp down to the D shaft firmly.
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Re: comparing XL belts to GT2 belts

Postby brianlow » 2013-Feb-Thu-23-Feb

Thanks for the comparison, it is really helpful.

Where did you get the parts? Do you have any other mods on your printrbot?
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(like StackOverflow for 3D Printing). Printrbot Plus v1.9ish.
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