Ausxmods Pulley for Prusa Mendel

by GregFrost, published

Ausxmods Pulley for Prusa Mendel by GregFrost Mar 21, 2011
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When I printed the standard pulley from the Prusa git repository, I found that my T5 belt didn't quite fit it and the belt would ride up on the teeth. In response to this, I modified the design iteratively, just printing the tooth portion until I came up with a design that meshed nicely with the Ausxmods T5 belt (http://ausxmods.com.au/t5-timing-belts).

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Ausxmods Pulley for Prusa Mendel by GregFrost is licensed under the GNU - GPL license.

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i was having the same jumping belt issue no matter how slow i made it go. i printed a couple of these and wow my problem was fixed. these are great pulleys. i found out one important fact when printing replacement parts.. ALWAYS PRINT A SPARE.. i printed 2 of these one for the x and one for the y. and i broke 1 while installing in the y. (bad angle on motor had to use tools and i snapped it.(i had a bad laminating in one spot i guess) had to install an old one then recalibrate then print another one.. but they work great

If your pulleys are too large, chances are your settings are out of tune.

I had a discussion about this with prusajr.. he showed me that his pulley dimensions are the same as the normal pulley dims...

I also ran some experiments and discovered that if your have flow set too high (or E steps per mm too high).. so that a single walled object turnes out with fatter walls
than layer thickness times Perimiter Width over Thickness.. the place it really shows up is the pulleys are too big for the belt..

most other object don't show up this error because having the perimeter slightly overstuffed makes a 30mm cube 30.4 mm square say... within the realm of reprap 'noise'.

I advise you check by printing a single walled object and making sure the perimeter works out as it's supposed to... (within 10%)... Unless prusajr changed the pulley again.. they should be correct and if you have trouble with them printing too large.. it should come down to tune...


Don't forget to submit changes back to prusajr for consideration.

Nice to know i'm not alone in having the pulley problem (http://garyhodgson.com/reprap/2011/03/belt-and-pulley-problem/)http://garyhodgson.com/reprap/....

Even though my belt was from Thingfarm (http://thingfarm.org/product.php?id_product=29)http://thingfarm.org/product.p... and pulleys from 2PrintBeta (http://www.2printbeta.de/product_info.php?products_id=19)http://www.2printbeta.de/produ..., once I get mine printing i'll give this file a go.