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Samer Najia
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T5 belts and pulleys - source and replacement?

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I purchased an LC kit and the build is coming along nicely. I am ready to add belts but I wanted to ask about the cogs for the belts. I know the LC needs one 16" belt and one 26" belt. Do I understand correctly that these should both be T5 6mm wide belts? Also, can the cogs/pulleys be replaced by Aluminum ones (preferably with flanges to help keep the belt on in case some slack develops)? And if so, can the accuracy of the machine be improved by increasing the number of teeth in the pulley?

Thanks,

Samer

Edited by: Samer Najia ( )

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Brook Drumm
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We use XL belts currently, but are in the process of sourcing GT2 belts and manufacturing our own GT2 pulleys.

You can upgrade to injection molded pulleys if you have printed ones. Or aluminum.

There is a debate over whether or not GT2 - or other finer pitch belts and pulleys actually increase the resolution. I am not convinced they do, but I am converting over eventually b/c of perception. It certainly does not hurt.

cheers,

Brook

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Samer Najia
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I ended up getting T5 belts and T2.5 aluminum pulleys and I am waiting for them to arrive. Certainly, I worry less about cracking those pulleys as the most I am likely to do to them is ream out the bore to fit my stepper shaft. I think that your resolution is as much guided by belt and pulley as the stepper increment. If I vary the diameter of the pulley, I can change the travel amount (small step, larger travel in bigger pulleys). After thinking about it, all things being constant, I don't think the number of teeth matter. What I think an increase in 'teeth' will give you is better control of the belt, assuming there is no slack in the belt and the teeth in the belt and pulley match exactly.

My preference really is to use a screw cog assembly, much as you have in the vertical axis of the printer. I can control the travel by changing the pitch of the threaded rod. I saw, on Thingiverse, someone who devised a linear gear that you bolt onto the table and the number of teeth there and on the drive gear control the travel in that horizontal plane. I like that because there is no need to worry about slack and belt wear. Something to consider if you are planning an upgrade, and maybe even offer as an 'upgrade'.

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Mike
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I noticed I couldnt order a replacement belt on the printrbot website. I have the injection molded pulleys but was wondering what pitch of XL belt I would need to order a replacement. Do you have a recommended source to purchase the belts from? What are the specs on the belt and pulley?

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