<t4nk_fn>
InPhase, I added my trial prints as well ;)
<InPhase>
Why are you printed such fat pens?
<InPhase>
s/printed/printing/
<t4nk_fn>
mmm, well, not really sure, guess I wanted some 'meat' to make them more sturdy
<t4nk_fn>
heh.. I also have some kind of a trauma from when I 'designed' some switches to print, they were skinny too
<t4nk_fn>
but uhm.. if you put these on a cnc.. and they get caught somewhere.. it would take nothing to snap them in half too
<InPhase>
You might have your print temp too low.
<InPhase>
Printing at low temp makes delamination happen easier.
<t4nk_fn>
... I'm using some kind of awful profile in cura .. downloaded it at some point 'filament friday' something? 'extra fast'... I'm using a 3mm nozzle, and I think a .28 layer height
<InPhase>
It's worth doing some tiny test prints to adjust print settings for better part strength.
<t4nk_fn>
all I know is that it prints a whole friggin lot faster than any normal profile, and I mean really really fast
<InPhase>
3mm is huge. :)
<t4nk_fn>
and since I'm only after functional prints I usually don't care.. don't know much about printing though
<t4nk_fn>
euh
<t4nk_fn>
lol.. .3mm ;)
<InPhase>
Ok. lol
<t4nk_fn>
why the temp remark though?
<InPhase>
Because you implied those snap easily. That should be pretty sturdy at those sizes.
<t4nk_fn>
ah
<t4nk_fn>
no, .. I haven't snapped these yet
<t4nk_fn>
lol
<InPhase>
I've had cm thick rods snap at low print temp, but at high print temp you could, hypothetically, bonk somebody over the head with one of those.
<t4nk_fn>
but I once printed some skinny tubes to use in swithes I printed.. those would snap when I pulled them from the bed already
<InPhase>
7 years back I used printed parts to mount my baby gate at the top of the stairs, since the included mounting parts didn't fit the space I had for it. I only trusted it because I had done a bunch of tests of part strength under different print conditions.
<InPhase>
And that thing wasn't going anywhere.
<InPhase>
I estimated it would hold up to a 200lb person falling into it, even being mounted into drywall, due to the arrangement of the mounting brackets. Although I don't think any 200lb people fell into it to test it.
<t4nk_fn>
I didn't want these pens to budge.. I'm hoping to use them to align my machine a bit.. print some triangles or so, and measure them for accuracy
<t4nk_fn>
I've tried some other kinds of mounting before but those were rubbish
<t4nk_fn>
btw, I do wonder how long 3d printed stuff under stress would last, seems like there's all kinds of factors that have effect, like uv and such
<t4nk_fn>
I used 3d printed bearings in my first cnc build.. and they were brilliant, but at some point I noticed more and more backlash because they were wearing off
<InPhase>
There are some shape arrangements that I found very difficult to get sturdy under repeated stress. I had a lot of trouble with door levers and growing children, because those were thin rods that were continually yanked on with high leverage by overly aggressive children trying to open the door like the lever is their mortal enemy.
<InPhase>
After 12 months even the best print conditions I could come up with would snap under those conditions.
<InPhase>
If treated properly I think they would last substantially longer.
<t4nk_fn>
some people put the prints in the oven I believe
<InPhase>
Yeah. That seems to help a little bit.
<InPhase>
Like maybe 30% more strength than good print conditions give.
<InPhase>
I haven't done it, but I watched a lot of videos of people doing strength tests with the fine sand oven method.
<t4nk_fn>
I think I saw some of those too yeah
<t4nk_fn>
all in all I've very positive about 3d prining.. it's by far the most useful thing I got
<t4nk_fn>
crazy how many people are actually printing pens hehe
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<t4nk_fn>
'it writes!' I saw... duhh.. it's because you put a real pen in there, it writes without the plastic too hehe
<t4nk_fn>
but, these are all normal pens. if you have a look on thingiverse for example, for pens for a cnc machine .. there's just a few designs, and I don't like them at all
<t4nk_fn>
so I went with my own, you can just insert it like a normal bit so there's no need to change the setup and so
<t4nk_fn>
and the one with the filling sticking out is pretty handy too, because I can use a full pen without having to cut it.. and it's still short and sturdy
<t4nk_fn>
I can put all kinds of other fillings in there too
<t4nk_fn>
what's the idea there, just to use gravity to maintain contact with the paper?
<t4nk_fn>
can't lift it off the paper that way, right?
<t4nk_fn>
I find a little spring works best for me, give it a little pressure so it will compensate for the height difference
<t4nk_fn>
a very soft spring for the felt tip though, or it will be too much
<J24k80>
there is a spring (or rubber band) to hold it down - you can lift it as it moves only 5mm. This ensures that the pen can't deviate but still will not be pressed into the paper
<J24k80>
it is a linear bearing instead of just a glide hole
<J24k80>
did you use two sets? As this will only stabilize on one plane.
<t4nk_fn>
yeah, those were for a small z-axis, I used four of those
<t4nk_fn>
fun as it was to make them.. I wouldn't go through it again today, but rather buy a superior product ;)
<J24k80>
if one (or two) bearing had a set screw this would probably better than most of the D-wheels you see in printers. Also have seen cheap linear bearings that had way to much play
<J24k80>
plastic parts are for sure no match when you work with higher forces for CNC milling metal
<t4nk_fn>
yeah, a set-screw would have been nice, yet they fit really really well, no play
<t4nk_fn>
on my current cnc machine I'm using square tubing, with 16 bearings on each side of the y axes
<J24k80>
if you get the parts perfect you can have amazing guides also with plain bearings - but you can't adjust them later and if PLA is used they will have some creep
<t4nk_fn>
there's no plastic in my new design
<t4nk_fn>
but the drawback is that there are a lot of nuts&bolts to go over
<J24k80>
you have to deal with weight - which is why some printer use CFRP rods
<J24k80>
And PCCF or PACF filament have some fantastic properties - still wouldn't use it if you want to mill steel
<t4nk_fn>
the forces really are tremendous
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