How do you know what kind to buy? What wavelength does it protect against?
So my image distortion problem is that one of the cables for one of the gantry motors had broken and so was not working.
I solved my over-tight wheels by installing 3D printed auto-tensioners for the bottom set of wheels for all the carriages. I posted my design over on Thingverse.
OK problem solved. I did some more fiddling with the solder-flooded connector and was able to open it up sufficiently to accept its male pin. It's not pretty and I will replace the cable when the new ones come in, but this was definitely the problem. I tested and now I get perfect circles.
Test after fixing:
Well, I was able to solder a lead to one of the connector terminals OK, but the other one the solder flooded the terminal so it will no longer fit over it's male pin.
So, I have ordered replacement cables from EleksMaker. Sadly it could be nearly a month before I get them.
I believe I will use hot glue at junction on the ends of the cables to keep the conductors from flexing back and forth at the connector.
So I had a hunch that both motors on the gantry should be working together. I figured if one was unplugged, the gantry should still move, perhaps not as cleanly, but it should still be driven by one motor on one end of the gantry.
So I removed the drive belt from the right-most motor and discovered that it would move. I removed the drive belt from the left-most motor and discovered that that motor was only twitching, not turning!
I pulled the cable from that motor (connector is on the bottom side not normally visible) and noticed two detached leads!!!!
This is probably the problem. I will fix and try.
I have tightened up the belt until the motors can't move. It's not a tension problem. I have examined the teeth on the belt and the spools, and they are fine.
I believe there is an electrical problem. One thing I am noticing with LaserGRBL when you make a button to go locate the image center, it does so by first moving the laser head (X axis), and then the gantry moves into position (Y axis). When the laser head starts moving, the right-most gantry motor "twitches" for an instant.
Here is a video that shows the twitching of the right gantry motor when the laser motor moves:
I also removed the right-most gantry motor drive belt to examine the teeth. When I did this, and I moved the gantry back and forth (the left motor is still belted, and so is turning), I can feel vibration from the free-spinning right motor. It's like manually turning the left motor is causing tremmors in the the right motor. If I unplug the right motor the feedback goes away.
Another thing I have noticed before is if you move the gantry manually quickly it will make an LED on the laser head light up. I wonder if I have been driving the motors like little generators and damaged something by manually moving the stepper motors?
Belt too tight:
After loosening the belt:
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