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Your laser does not look exactly same as mine x700 - especially ramp construction. It's hard to say what differences there are, but do NOT "copy and paste" setup from other machines - without...

For test probably fiber with low power (used Chinese 30-40W?) will do, but before you go just try to go some other shop and check if surface/cut quality is good enough for your needs. Personally I...

Never seen budget machine with >minimum 15" height<, actually probably with $ 2000 will be not easy to found anything close to your needs.
With €300-600 budget probably something closer to 1.5"...

Definitely on RF machine is a way easier than on DC.
Sadly Hseboston don't come with more details as for example budget range.

Beside all other things:
Keep in mind if you will use white paper for invitations and you cut it with a laser you can expect slightly brown edges. Some material works better than other - but still...

I remember some rumor year(?) ago about fake RECI tubes (@ ebay?) which was labeled RECI but was not even physically identical to their products. Unfortunately I don't heave links to that. Best way...

I have CW-5000 from S&A (original one). It is working great with 80W machine. Be sure you use proper one, as they have few different models od CW-5000 - voltage, frequency, water flow and usage...

My mate have 3 different laser machines: K-40 40W; 80W red&black and big table with 160W. Even with really well focused 80W and 160W (and short lenses as 1.5") he can't go close to K40 quality of...

In my own (I use Ruida G6442 controller) I can set speed 0.1mm/s - so it's not possible directly to set speed to 0.
BUT I can use "fire" button on panel and beam will be firing as long I keep this...

At 5:57 here https://www.youtube.com/watch?v=wXy654KknzE&list=PLKqvqV6FhMtWv-wab69zSEvSEPDgJN4cz&t=0s&index=19 you have wiring for Ruida controller.
Note - it can be possible to connect water switch...

It's normal. Don't worry. Actually it's better than "standing" as electrode is NOT eroded in one place, has less oxidation - so it's prolong tube life. This circular design is on purpose.

Membrane switches used in Ruida controller are poor quality. You can buy replacement, but it will fail again in time. I have prepared switch-panel with micro switches, NOT finished/soldered yet, as...

Generally no big deal - unless you do a lot of engravings on expensive details and misplacement can lead to extra costs.

Loose lens?
Loose/vibrating one from mirror mountings?

Country ?

Check grounding (earth) wiring on machine, especially unscrew and check grounding connector. They sometime do NOT connect properly grounding wire to machine body. This can cause unpredictable actions...

Generally buy light gray in color. Easier to manage and see what is wrong with machine.
It's hard to know what you want to do with a laser, so my suggestion is a same.
If you want advice you have...

Run test file from origin.
Next move head a bit, say by 2mm in each direction, set new origin and repeat exactly same test.
IF displacement is similar on both cuts that's mean "fault" is related to...

I will give you one tip extra: on low power machines cut will be slow and char on cut is a strong. So strong- it is a hard to paint/glue it later. Using sandpaper does not solve problem, as it is not...

Try to found someone near you with power meter. Cheapest.
Buy simple power meter - bit more expensive, but way better.

See Nate33 post from 05-02-2018 "Laser wont stop firing..." and answer from whipman about connections.

As fair I know RDLC320 is NOT working with new versions of RD Works (but I'm not using one from them, so no following all info).

I'm not sure if I really got what you mean, but if your problem was SAME starting work position you should work with pictured setting (absolute coordinate) in RDW.
...

Please do not take him seriously. Conglomerate of spam slogans and "hidden business links". Even dangerous. (PVC cutting at point 9 )

Just to be strict - Ruida 6442 is in same price range, 252$ including delivery...

Ruida 6442G is popular and well documented on Internet. I didn't see step by step manual but should be not deadly hard for tech skilled person. There can be needed to fit/replace stepper &...

IMO (almost) all new Chinese machines from e-bay are designed and made to be extremely cheap. Cheap as possible. Yes, this is the main point - price. They are working, but they are poorly designed...

Look at:
https://www.lasermarketsresearch.com/coherent-rofin-merger-approved/
"GSI Group changed its name to Novanta" and blogger mentioned about they own Coherent and Synrad brands which are well...

Chinese: for people who have technical skills to check, replace broken parts and fix issues and want low-budget machine. Great for cut bulky parts.
Western: for people who need a really reliable and...

Not exactly. More - don't believe basic information provided by sellers.
For example laser which was sold by supplier as "2W LED laser" has module which was supplied by manufacturer who wrote:...