@Trish - What @Christoph was looking to do ... so you are already looking at what I was talking about.

@0scar - Sweet.

Duplicate question: 3dprinting.stackexchange.com/q/7019/5740 duplicate of: 3dprinting.stackexchange.com/questions/6522/…

good one

@Pᴀᴜʟsᴛᴇʀ2 It would be good to get an answer for that question, it's been hanging about for a while now

@Greenonline - The data is out there ... I'm just not quite sure how to interpret it, lol.

To me, it looks as though acetone is by far superior to the other substance mentioned ... I'm just not sure if I'm reading it right.

Mate, I have no idea! :-D

@all, @0scar, @Trish, @SeanHoulihane - This question Low Filament Sensor for Crealty CR-10?, I'm not sure why it is marked for closure as Opinion based. I've got an answer for the chap, and it is factual, based on the board that they have. Would those who voted for closure like to reconsider, and maybe retract the votes? BTW, I have no idea who voted, but I'm just asking the regulars... Thx :-)

@Greenonline The question is phrased as "Is this item what I want?"

That sensor question could be read as a shopping question, but it's really asking how to decide if a product will work, which is a slightly different thing, and actually perfectly reasonable.

@Trish - yeah, I guess so, but (I think that) they really mean, "How can I get a filament sensor to work on my CR-10?", or as @SeanHoulihane says, maybe it should be reworded (slightly) - i.e. we do it for them, to "Will it work?"? It seems to be a toss up between "How can I make it work" and "Will it work"

@Greenonline - Modify the question just slightly to take the opinion out of it, leaving a comment to the OP as such, telling them you changed it to make it more objective. If it's not what they want, they should let you know.

@Pᴀᴜʟsᴛᴇʀ2 Ok, will do :-)

That way it's a win all the way around.

@SeanHoulihane that is an assumed intent. I don't do such a change unless the intent is clear. To me it reads, as said "Is this what I want?" which is opinion based, because I have no idea what they want.

@Greenonline No idea if they want THAT

The question is phrased in a way that allows too much wriggle room. Querrant should clarify.

@Trish - Sometimes you just need to roll with your gut on these things. People often say "is this what I want" when they are just asking if it will suit their needs as described.

@Pᴀᴜʟsᴛᴇʀ2 That question triggered too many flags for me.

I get yah.

@Trish, @SeanHoulihane, @Pᴀᴜʟsᴛᴇʀ2, @0scar - I've made a stab at rewording it and left a comment. OK, I have spent hours on this today and missed most of the sunshine, I'm out of here now to do some gardening. :-)

I try to err on the side of caution on these things, especially where the site is concerned. I look at questions to see if they are salvageable. If so, correct as needed. The OP will let you know if you're off base. You save the question, give a higher QPD for the site, and get a usable answer out to the community.

@Greenonline - Enjoy!

thingiverse.com/thing:3096598

^^ This is way cool!

Editing the question to improve usually seems a better option, often it's the easiest way to help clarify the OP's intent.

@SeanHoulihane - Especially for new users.

@Pᴀᴜʟsᴛᴇʀ2 thanks for forwarding my chat question! I couldn't respond yesterday (kids...).

do you think that "which type of linear guide do I need for a foam cutter" is an appropriate question for 3d printing SE? it's not 3d printing as such, but has very similar basics

@Christoph - I'm not sure. I'm still learning 3d's on/off topic strategy.

@Christoph I'll try if my colleague is willing to share some info on his foam cutter. I have to dig in my memory, but I think he explained he is using an Excel tool to generate some sort of instructions set, but I don't know what language that is. Are you designing a foam cutter for model aircraft wings?

uh... Any? a foam cutter has pretty much a very low load, but you need to make sure they are very much precise...

@Trish Actually the load is pretty big, but it is perpendicular to the y-z movement!

I think rails would be most stable... Like... a stepper-rail combo as vertical axis mounted between linear rails (lower one driven?), and that mirrored to the other side, connecting the two main pieces?

I'd use it mostly for aircraft wings, yes. I compared prices for quite a few guide designs and now am facing the question where "crappy" ends and where "too good" begins. Maybe I'm also overengineering here, but that's part of the fun

@0scar well, all depends on the temperature to cut it.

load can be big if the rails need to take the wire tension force as well. they the rails just carry a "bow" around, there's almost no load but the mass of the moved parts

If the tension is too low, the wire sags out or drags behind and you get crappy wings. I've cut many wings, we did that by hand

yes, wire tension should be some 10 N. But that force isn't necessarily a load to the linear guides if there's an extra part (like a bow sans arrow, if you know what I mean. not a native speaker...) that puts tension on the wire

Yes. One end can hold the wire fixed, the other end needs to be free, but on tension. This allows the wire to adjust the length when you are cutting way smaller tip profiles than root profiles.

Cord wise I mean

We used to make a scale on both cords and read them aloud when cutting.

And you cut with a kind of (wooden?) frame that puts tension on the wire?

and move that frame by hand

No 2 people, and a simple bow, and steady hands :)

the point is that you didn't feel the wire tension in your hands, you just moved the bow

Tension was kept by the springs of the H frame

now getting back to the force acting on the rails: if the wire is moved in x/z, and if the rails move the H frame, there's no force acting on the rails in y

that's basically what this thing does: thingiverse.com/thing:2198575

Yes, but I wonder if this example you give is able to print 2 different profiles and cords, it looks as if it can only print similar profiles at each ends. My phone dies not allow me to show how the bow is connected to the Z axis, it's too small to see properly.

Later peeps!

I'll try to figure that out. but it looks like it's actually the wire that is moved

then it could cut different profiles and chords

the first picture (thingiverse-production-new.s3.amazonaws.com/assets/c6/c7/0a/04/…) has it all: The wire is moved, and the bow is suspended with strings hanging from the black almost-vertical rods