I’m having some difficulties finding the right settings for Stahls CAD-CUT HTV. First I should clarify that this brand of heat transfer vinyl does not produce chlorine gas when heated or burned. It contains no vinyl despite the name. I think they continue to call it that not to confuse people who normally look for “HTV” when ordering material. Stahls has a whole page on MSDS and safety for this material in laser application. Just wanted to clarify that before I get mobbed on how this “is a bad idea”. Ok - with that out of the way ha!
Cutting through is no problem but we were hoping to burn off the areas that would normally need to be weeded. This is shown in various videos on Stahls blog page using their “Universal Laser System” which I believe is a 60 watt laser. This looks fantastic! Unfortunately we have had problems finding settings that will work. So far either we blast through the carrier material or we get incomplete raster ablation leaving fuzzy edges and unwanted material left on the carrier film.
Also Unfortunately the material configuration shown on Stahls videos appear to be a preset for the different types of CAD CUT HTV that Stahls has which provide no insight into what settings were used.
Actually reading comprehension is bad over here apparently. You want to do raster ablation, essentially engraving the HTV to eliminate weeding, yeah? Some people experimented with this. Are you hoping for a kiss-cut kind of thing, or is complete removal of the substrate ok too?
I know people have done that, definitely with paper, but some people have tried it with “vinyl” too. Let me look a sec.
Ah - I jumped the gun on your first suggestion - thanks anyway for that file - still very useful. I found the post regarding the Siser product yesterday and tried to use the same settings for Stahls HTV. No joy, I think the material thickness or composition must be different. Thanks for linking that. I may have to order the Siser product to try.
So that cut test… there is a engraving test equivalent.
I hesitate to recommend it, because I generally think it’s hard to get engraving dialed in in a meaningful way – there are so many variables. That being said, this is one case where it might help because the material is in theory really consistent. Let me dig one up for you.
This is a good simple-ish example:
You can really go (imo) overboard on this though. There are some seriously detailed engrave tests out there.
I think @rbtdanforth has a really complicated one that would probably overkill this job, but it’s good to know about. @rbtdanforth, you got any advice here?
Very cool - it gives me an idea of making something similar for thin film style materials. I think the thickness on the Stahls HTV is something like 0.009 - so I may try to create a test equivalent. Thanks for your input so far, its been very helpful!
I have a mod of @evansd2’s design that I use as a standard reference for each type of wood. They are small enough to fit them all in a box and they don’t use up much of the wood that you need the information about.
Others have done much more complex styles if you have the spare wood.
Ok! This is probably an edge case for some Glowforge users but I think I have found something that works for me. After trying dozens of varying speeds and power intensities it was getting pretty discouraging. Even when able to achieve a kiss cut it wasn’t very clean especially in parts of the design that were high detailed or designed to look distressed. The best way I found was with a two pass raster etch.
Also critical is that the color of design that you are trying to etch out leaving only the carrier sheet must be 20% grey. The first pass will look pretty cruddy but the second pass cleans it up nicely!
This specific combination produces a clean carrier sheet with nicely isolated graphic elements when used with Stahls Fashion film in white. Other colors or brands of laser safe HTV may not produce the same results depending on how much light energy the material absorbs or the thickness of materials.
Thank you! It did! Looking at the test template you linked It got me to thinking of how to create a simple graphic which just ended up being 10 squares that started at 10% grey all the way up to 100 black. From there it was just a matter of seeing which of the squares had the HTV ablated cleanly while leaving the carrier sheet intact. The extra trick was dialing in multiple passes with it and not using any of the dithering or pattern modes of engraving.
I’m new at this so I probably would have stumbled along one variable at a time for another week unless you had sent that. Thanks again!
If anyone is interested here is the result! My wife and I have a small side gig doing direct to garment ( DTG ) and screen printed apparel. I wanted to integrate heat transfer vinyl for doing just the garment tags. Up until now HTV wasn’t an option because of all the weeding needed. With the glowforge blasting away all those areas that would normally need to be weeded HTV is actually a viable option now. This way we can batch create sizing tags and have them ready to heat press after the rest of the garment has been DTG or screen printed.
One less thing to line up on the press. Messing up a garment that’s been completed just because the size tag didn’t screen or DTG properly sucks. Hopefully this helps with that.
Also attached is the simple guide I made to figure this out as well as a screen shot of the latest optimized settings and the final result when pressed onto a garment.