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If they changed the mainboard, make sure that you have the latest firmware update.

1. GCC Lasers are manufactured in Taiwan, not in China.
2. The radius issue is coming from "backlash" or "slop" in the x&y axis combines which makes arcs and radiuses become "flat" spotted.

Look...

You will find that some laser tubes that have a SEPERATE exciter / RF unit must be tuned (or matched) to each-other. Connecting un-matched RF unit and CO2 tube can damage the tube.

If it is all...

You will find that this problem is not the software but something in the items I have already replied with.

The Radius issue happens when the motors, belts or rollers fail.

This I can guarantee.

Do yourself a favour and purchase a Parallel Card and run your GCC from a Parallel cable.

It can be done from a USB but it is often very problematic. A lot of times before, I have reccomended this...

The GCC Mercury is actually a very good machine.

I would very much suggest getting it serviced before judging it so harshly.

I saw many people making models and parts with GCC Mercurys and they...

From someone who has been factory trained by GCC in Taiwan and spent a couple of years maintaining everything from GCC Venus to the GCC GaiaII, I can assure you that you should never EVER lubricate...

The "laser" looks like it is OK.

For everyone's information GCC Mercurys do not have external encoders, so the troubleshooting should be in this order :

1. Make sure that the X & Y motors...