I used the Ultimaker-provided flat-head 2mm and still seem to have stripped the screws while screwing them back in.
The pulley did not spin on the shaft when I tightened it. Given that, do I want to buy something like this? Or do I need to buy a replacement pulley as well? (For what it's worth, I think the issue is the pulley slipped a tooth, not excessive slack.)
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gr5 2,224
Did you use the proper diameter hex tool? These set screws are incredibly tight and so if you use the wrong tool you can strip it.
You want a metric, 2mm hex screwdriver. You want a flat end (not a ball end). In fact it's good to have both types of hex drivers (ball end, and normal) for these printers. The ball end lets you come in at an angle. The flat ends hold screws in mid-air nicely. I don't think the ball ends are strong enough to tighten these.
When you loosened the pulley, did it spin on the shaft? Can you double check that? If not then something is wrong with the spring inside the sliding blocks.
You can buy an entire sliding block/belt kit (I don't think you can buy the belts alone). Or you can take apart the offending block and there is a spring system. It's quite difficult to get the block apart, and it's tricky to get it together with that powerful spring in there. That's why they sell them as assemlies.
The assemblies do not include a pulley.
You can get a pulley from your reseller. You can buy them also on the internet but I don't recommend that. Many have the center hole badly aligned with the pulley. Even just 0.1mm of offset of the center hole on the pulley means you will have + and - .1mm errors on the positioning of the walls of your parts.
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