belts getting looser ?

[ian 32]

I printed these out for my ultimaker and they really helped me improve the quality of my prints.

http://www.thingiverse.com/thing:19892

but these belt tensioners are still perfect but the rubber in the belts have stretched and are now loose again.

I cant fit more of these belt tensioners, as they will start running into the pully wheels.

so what can i do ?

Thanks guys.

Ian

[IRobertI 516]

Try adding these?

http://www.thingiverse.com/thing:17058

 

[magmotor 0]

I tried quite a few but none worked as well as these....

http://www.thingiverse.com/thing:19818..

. I imported his DXF file into AutoCad and made them thinner so I could put two on each bracket....really works well and can tighten the belts really tight and they stay tight...no worries about hitting anything either....