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Topics - kibodwin

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1
General Discussion / help! broke glass print bed!!!
« on: April 12, 2018, 01:09:46 AM »
Trying to get the scanned (3d systems sense scanner!) print of a colleges body off the print bed I cracked the glass print platform into bits. I think I saw that as it is a heated bed I need to use  borosilicate glass.
Is this the case or can I use any old glass? (I have the glass from an old paper scanner I can use, no idea what glass this is.).
Is there a preferred thickness? The original is 3mm but I am not sure if this has an effect on printing..
Do you have a preferred supplier for replacement glass? I will probably get some off eblag but will also look for a local supplier.
=)

2
https://hackaday.com/2018/03/18/3d-printer-halts-and-catches-fire-analysis-finds-a-surprising-culprit/
Looks like this time it was a loose heater block and not the usual culprit, the heated bed wires coming loose.
I use a webcam to monitor my printing when I am no in the same room....
Please check your printers connections and add a cable relief to the bed heater wires...
Scary stuff, be safe.

3
General Discussion / remove / reduce engraved chopping board smell?
« on: March 15, 2018, 07:41:46 AM »
Hi,
I have engraved a bamboo chopping board and it smells quite strongly. I have washed it with vinegar but
now it smells of burnt wood and vinegar!!
Any ideas as to how to reduce the strength of the burn smell?
How do you remove such smells on wood?
=)

4
Post-Processing 3D Printed PLA Print with a Rock Tumbler
https://www.youtube.com/watch?v=ZcFex7BAhrI

Moderator,
I would have posted to the 3d printer section but I think this could be
used on other materials, a test on laser engraved wood would be interesting...
feel free to move to the correct section
=)

So I saw this and think it might be a good way to clean up what are messy prints
that I seem to be getting on a certain filament ( filament could also be too humid).
I am wondering about a few things;
How noisy is this, a lot I suspect.
What other materials can be cleaned like this, cant see any engraving surviving this.
could this be used to cloud glass surfaces to facilitate laser engraving?
What alternative to screws (seems like a doggy choice, how about metal ball bearings? sand? gravel?).
could I just put the full print in, supports included and hope the supports get cleaned away?
would I need a higher infill and wall thickness to protect the print
what effect would adding water to the tank have?

I personally would not chose a stepper motor for this long run, seems a bit over kill, a geared DC motor  or a windshield motor
would do, no mC needed. I would also like to see some sort of clock /timer, the more analogue the better.

=)

5
General Discussion / multicolour gradient filament in EU?
« on: March 05, 2018, 04:47:26 AM »
Hi everyone,
I have bought a TronXY X1 for my daughter, it is a build we will do together and in the end will be her own printer (I know, she is spoilt!). This morning I foolishly asked her what colour filament she wanted to use.... and... she wants a rainbow colour filament!!  :o
So I googled and found a supplier in the US and another in Canada but none in the EU.
I have seen the adaptors for adding colour to neutral filament with colour markers but this would be a last option. I have also tried to weld filament together but the tolerances of my extruder are so tight any change in diameter causes blockages so not really usable.
Anyone know of a supplier of rainbow filament (1.75mm pla) and help he become the best dad in the universe??
=)

6
Projects / engrave skateboard, both sides?
« on: February 27, 2018, 09:00:09 AM »
Hi,
As an owner of laser I get loads of can you requests... not that I mind.
I have been asked by the local youth if I can laser a skateboard deck. The back
should not be an issue if I sand the paint off as it is maple ply but I got thinking about cutting off
some of the grip part. I dont think it should be an issue but I think the sand (is it sand) used for grip might be difficult to cut through.
I have a 2.5 blue diode laser and a K40.
Anyone already tried cutting grip tape on maple ply?
=)

7
Projects / 3D printed fume extractor
« on: January 30, 2018, 09:22:30 AM »
in the why did I not think of this before section;
https://hackaday.com/2018/01/29/take-a-deep-breath-thanks-to-a-3d-printed-fume-extractor/
3D printed adaptors for an inline fume extraction....
now, what kind of fan power (CFM?) would you guys and gals suggest for a K40 CO2 laser?
I think if the suggested fan works for the K40 it will also work for the 2.5W diode... so I would be killing 2 birds with one stone.
=)

8
Engraving / engraving on carbon fiber??
« on: January 23, 2018, 05:16:56 AM »
Hi,
I have been asked if it is possible to laser engrave carbon fibre... I see that several people have done so successfully online but...
I have a 2.5W and the K40, is this sufficient or do I nee 'MORE POWER' ???
I presume all we are doing here is burning the glue as I doubt these lasers can 'cut' carbon fibre..
=)

9
Inspiration / looking for elastic band gun...?
« on: January 22, 2018, 02:13:26 AM »
Hi,
I have searched the usual places but cannot find any laserable plans for a simple (or multi rubber band) elastic band gun.
Anyone have such a thing or know where I can find some?
Thanks,
Ki
=)

10
Projects / test engravings on K40
« on: November 03, 2017, 02:30:58 AM »
Here are some test engravings using the cohesion3d mini board.
https://photos.app.goo.gl/wnTz3jRGA0Jg6umW2 friends project svg logo, used ot make sure I can engrave vectors!
https://photos.app.goo.gl/gjvDTaueoJKwj8fs1 3mm mdf phantom F4
https://photos.app.goo.gl/ymHpcEuIcZDHQ0BW2 3mm mdf tomcat
https://photos.app.goo.gl/NzlzpdBRS7VTsQHZ2 test engraving on slate, would have liked better contrast but this is the back side so the front being darker should be better.
=)

11
CAD Software / jpg to vector file?
« on: October 23, 2017, 07:26:14 AM »
not sure this is the correct place to post so feel free move as necessary...
I have only recently started even trying to use graphics software so please take this into consideration...!

I am trying to convert  jpgs I have into vector files, I though SVG was the file format I needed but this crashes my laserweb on my  laptop. DXF seem to be better in laserweb.
How do you convert your pictures to vectors?
I am trying inkscape (no luck, cant get to grips with it), coreldraw (I have made better progress with this), and https://www.vectorizer.io (am getting a bit lost with all the options). I am trying the automatic mode in https://vectormagic.com
Are there any tips and trick for these sorts of conversions? When I try in coreldraw and vectoriser.io I seem to lose a lot of quality, is this normal?
=)

12
General Discussion / Something nice for the S.O.??
« on: October 23, 2017, 06:17:14 AM »
I have been engraving technical drawings of fighter jets and a spitfire and now feel I have a good grasp on the engraving that I would like to do something nice for the S.O. Any ideas? My thoughts were all pretty classic, engraving pictures of the kids, laser cutting a pencil organiser and so on but I was wondering what you guys and gals have made for your S.O.? I would like something original and different, preferably that can only be made with our machines (I have a 2.5W diode and a K40) so that I have some sort of justification for spending so much of my free time with these machines!

So that you did not read all of this for nought here are some of the things I have been engraving on the K40
=)
https://photos.app.goo.gl/zEoj8Z2QZt8Un65Z2    phantom F4 on 3mm mdf (got to love old Ikea cupboard backing!)
https://photos.app.goo.gl/U8rTKAxokrWwjYwD2  lighthouse on some slate, would have loved better contrast...
https://photos.app.goo.gl/9DTwSgaPTlBbdwZb2  wildcat (first successful test on new cohesion3d mini board) on mdf

13
Laser Safety / Fire extinguishers.
« on: October 10, 2017, 01:20:04 AM »
Whilst I am far from being an expert in these matters, I would like to remind users of this forum that these lasers will set fire to some of the materials they put under them (obviously stone will not burn but pancakes will!).
I personally have a Co2 fire extinguisher (a grey top to the extinguisher, also way heavier than the other types) handy for any electrical fires but this is not to be used for paper / cardboard fires (as the pressure will blow the embers around, spreading the fire) but do use a water foam (in Europe (mostly) a blue bottom or blue handle). These ‘blue’ water foam fire extinguishers will put out most non electrical or grease fires (and most of the stock we use under our lasers). These ‘blue’ water foam extinguishers are also useful preventively, if you ever spill oil / grease / petrol you can cover these flammables with the foam water to prevent a fire.
To use, pull the pin horizontally (they can be quite hard to remove, especially with gloves), stand around 4 to 5 meters from the fire and aim at the base of the flames. Keep going until there is no more smoke or embers. Then give it a bit more to make sure. Be sure to also hose down anything flammable nearby to prevent the fire spreading.
Understand that once you start putting out the fire you will get steam and smoke, more than when the fire is burning, so make sure you have a safe exit as visibility will decrease drastically, especially in smaller rooms, it will also be more difficult to breath.
Of course, the faster you interact with the fire then less time and energy you need to put it out. I also have a 1 litre of water in a bottle beside the laser as well as a spray bottle of water to catch those little fires just starting, I also have the laser in an enclosure limiting smoke propagation. Turn off any air assist / fume extractors. These will allow me to put out any fire quickly, limiting the damage done (and saving my precious laser).
Always protect yourself first, you can always buy a new laser, eyes / lungs are more difficult to replace.
Try not to leave these machines running without supervision, if you must try use smoke / flame sensors. I use some connected up to an Arduino and I also have a webcam looking in on the engraving if I am not in the same room.
Most of all, be safe.

14
not at all related to the lasering stuff but I have been busy (hence me absence, sorry about that!), I just passed my level 1 volunteer fireman's exam today. Knackered but the next exam is Friday and the real fireman said I am a natural (pyromaniac) and will have no problems passing the next and final level. (they admitted they did not cut me any slack and pushed me harder than they would normally and I loved it). Off to get my proper fireproof uniform, helmet, boots and the breathing equipment tomorrow!!
Just a thought, seeing the glee the firemen have when they set fire to stuff, I am of the opinion that the ones I frequented are all pyromaniacs, and proud of it!! apologies if this comes out as an insult, it is not at all the desired effect, I have great respect for them all.
Off to get rid of the smell of petrol and burnt and have myself a nice Belgian beer!!
The missus cant wait to see me in my new uniform, but I suspect her idea of a 'hot fireman' is not what she will see when I show her my get up!
=)

15
General Discussion / 2,500W laser and jeans...
« on: October 04, 2017, 10:48:34 AM »
now I have seen it all..
https://boingboing.net/2017/10/04/baudrillard-selvedge.html
The old fogie in me saw a 2.5W laser and thought woot, I can do that now!!!
then sense kicked in and the eyesight rectified .. 2,500W is NOT 2.5w!!
shame
=)

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