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The DreamJet printer came with a laser height sensor, which wouldn't stop the print but would automatically drop the print bed down one notch any time the laser was tripped (even during printing). Since it doesn't actually stop the print process, no firmware modification is required.

Another option would be to figure out how to put the printer in "Pause" mode if the laser is tripped, which would also stop the print process temporarily....
 

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i do not think print head misalignment is the problem because he says unidirectional print is sharp and bidirectional makes it blurry.
Actually, this is a good indication that you need to run a print head alignment procedure. If the small format Epson printers are anything like the larger ones, there are alignment procedures for both UNI-directional and BI-directional printing. In UNI mode, you see far fewer registration problems (or blurry prints) because the droplets are all being fired from the same angle. However, when printing in BI-D mode, you have droplets firing from one angle when the print head travels left, then another angle entirely when the print head travels right - each pixel has to land in the same spot on the substrate, even though they're being fired from different angles, while the print head is moving in opposite directions.

The UNI alignment is only half of the picture; a BI-D alignment will probably solve your problem. With bi-directional printing, the gap between the print head and the substrate becomes more critical, as moving closer or further away could change where the pixels would land on the substrate, since they are coming from different angles - UNI-directional printing is more forgiving when it comes to this gap, because the droplets don't need to intersect.

On our DreamJet commercial printers, we had to print in UNI mode for almost a year before we found out how to do a full print head alignment; once we dialed them in, BI-D printing became no problem at all!
 

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This forum is stupid what a complete waste of time. I could have bought a dtg printer in the time it takes to compile all of this worthlessness. info due to the fact you can't find one reliable build doc out there for this sort of thing. Please reliable is the word who the wants scan loads of text just to find out the project can't be completed, where the hell did the clue book. Oh! Here is an idea get all York ducks in a row first then show some one how to build, not "JUST SCAN AROUND AND FIGURE IT OUT" WHAT kind of disorganized bull is this.
You should talk to whoever you paid to do all that work for you and demand a refund; sounds like the company you are dealing with is a serious PITA....

... Unless of course you are *ing about the fact that you would actually have to do your own research and compile your own plans to "copy" the work that other members of this community have generously shared with all of us for FREE...... In that case, shove it. These people show off what they have been able to do with their own hard work and ingenuity, and you think someone owes you a step-by-step manual to do it on the cheap and easy? Incredible.
 
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