There are several ways to clamp open loop timing belt ends together. Here are few of them gathered into one post with images and some with comments. Just a quick overview for ideas and images for quick reference. It could be helpful when you don’t know yet what method to use for clamping. Since most of them are 3D-printable you are in luck when having access to one.
What is timing belt clamp?
Belt clamps are useful for linearly moving parts in machines like 3D printers, CNC’s and engravers which are driven on belts. Basic idea is to take “open loop” belt and clamp its ends together. Usually it’s attached to moving part / gantry which trough power is transferred to gantry. We can do this since in these machines belt ends never have to reach pulleys. Most of examples here are for popular GT2 timing belt used in 3D pritners.￼
Simple universal clamp
Most common and simple one also found on widely on Chinese selling sites. Made out of some aluminium alloy or nylon. It’s probably simplest one to make yourself using simple tools. It doesn’t have to actually match tooth profile- matching tooth pitch is probably good enough. Basically you could do this from piece of aluminium or even plywood- with saw or file. I called it universal since it’s not designed to use in specific machine like some others in this post.
Simple belt clamp
Self-locking by teeth
This one uses belt teeth themselves for locking. At least for GT2 belt – the teeth match each other this way pretty well.
Next one looks like basically using same self-locking idea. But more like typical back pack strap style.
Crimp style is one simple way for connecting belt to frame. Also somewhat using same feature.
Belt clamps with built in tensioner
Previous clamps have one small drawback. They must separately be tensioned if needed. Here are some clamps with tensioning mechanism already built in.
Source: thingiverse.com – Prusa Y-axis belt tensioner by Christian Riise Wagner
Source: thingiverse.com – Vertical X-axis Belt Mount with Built-in Tensioner by Misha Tikh
Source: Thingiverse.com – Belt Tensioner/Clamp – Precision by Robert Bilbrey
Next one is basically same as “MakerSlide Belt Clip”, but with a tensioning feature. It’s also screwed into slot, but I think it’s still worth to highlight here.
Connecting ends together
Or why not – zip ties!
There is probably lot more styles out there, but this post is only for giving small overview of some of them in one place. Hopefully I have included enough different styles here to get imagination working.