takadakeyo wrote:

Yeah there's a hole that the but fits into on the carriage and the nut and screw's threading isnt stripped. Could the belt have actually stretched? I ordered new bearing to do the Lawsy's carrige upgrade. I just hope it prints ok before becoming more loose.

Belts are made just like tires. They have multiple layers of fiber and rubber alternating. They will tend to break before stretching.

Gottcha. Ill try replace my carriages and see if that helps. cant hurt right haha

Yeah there's a hole that the but fits into on the carriage and the nut and screw's threading isnt stripped. Could the belt have actually stretched? I ordered new bearing to do the Lawsy's carrige upgrade. I just hope it prints ok before becoming more loose.

Belts are made just like tires. They have multiple layers of fiber and rubber alternating. They will tend to break before stretching.

Could the belt have actually stretched?

  No.  (well anything's possible, but I'm more likely to win the lottery tomorrow than your problem being belt stretching).

try putting the screw in the hole with no belt attached. is it actually threading?

Yeah I can screw it into the nut on the other side without slipping out of the nut. If I take the nut out, I can push the screw through the carriage. Is the hole in the carriage suppose to be threaded too?

you can't stretch those belts easily, and you definitely can't stretch them enough to make it loose no matter what. Wardjr is correct. What most likely broke is the right side of the carriage where the M5 nut holds the idler pulley in place. If that pulley wobbles at all, your carriages are done for. A temporary fix would be some duct tape and a few zip ties around the bolt until you can print Lawsy's carriages. Alternatively, it is also possible that the X motor has melted the carriage and it's not sitting securely--can you move the motor at all? Both of these are common failures.

The SD4 only uses nuts smaller than M3 on the top panel. Is your top lid secured properly? Every other screw is either an M3, M4 or M5 (with the exception of set screws which are M1.5). I've rebuilt my machine from scratch a couple of times now so I'm pretty confident in that.

Ok I'll go check if I can wobble the pulleys and motor. Hopefully I can get up and running again to print new,carriages. I'll also check my lid for that tiny nut

Something is broken allowing the pulley to move closer to the center.  I would think under close inspection you will find something is moving or broken .vs the belt stretching.

Ok I'll try to take a closer look and see if anything is broken or out of place.

The SD4 only uses nuts smaller than M3 on the top panel. Is your top lid secured properly? Every other screw is either an M3, M4 or M5 (with the exception of set screws which are M1.5). I've rebuilt my machine from scratch a couple of times now so I'm pretty confident in that.

It it from the screw on the other side of the carriage (holding the other end of the X timing belt)?

There's already a nut on the other side on the belt tightening screw. This mystery nut is about half the size. Idk where it came from
But even when I tighten my x axis until it can't tighten anymore, it's very loose. What could have made it stretch so fast?