[tomkinstinch]

I have a 40W hobbyist laser cutter. It's fun, and a great tool for various projects, like making board games[1,2]. That said, sometimes materials inside the machine catch fire, and sometimes the beam reflects or dwells on a section of the metal enclosure. It's interesting that they've chosen to make the entire (?) enclosure out of plastic, itself a combustible material. I get why they went with plastic (cheaper to fabricate once you have the molds, lighter to ship, perhaps better dimensional accuracy than cheap sheet metal), but it does not seem particularly safe. The also seem to gloss over the need to ventilate the machine. Plastic fumes are nasty to breathe, glue-bonded wood (think thin plywood) can release formaldehyde fumes, leather may be dyed with heavy metals. What the laser doesn't cause to combust cleanly, it vaporizes. You don't want those emissions in your house of office, and you want them vented away from the optical components as quickly as possible so there is no deposition onto mirror or lens surfaces.

Another benefit of metal enclosures is shielding the power supplies of these things. High-voltage laser power supplies are noisy, and when you PWM them, they can cause quite a bit of interference. Metal enclosures at least help to attenuate RF emissions.

The "macro camera" is a clever addition for closed-loop optical control (if it is being used for that). Reminds me of attaching an optical mouse sensor the the lens sled.

1. https://igcdn-photos-b-a.akamaihd.net/hphotos-ak-xfp1/t51.28...

2. Make your own Carcassonne tiles! http://dev.tia.io/carcassonne_shading/

[borgel]

What unit do you have? I've been thinking about getting one.

[tomkinstinch]

I have an older one from Full Spectrum[1], from when they were adding their own control PCBs to generic units imported from China. The newer ones they have look nicer. There are a few other options on the market now, so it's probably worth shopping around. Larger cutting areas are nice, if for no other reason than that they limit the number of cuts you have to make on raw materials to get them to fit into the machine.

I made my own recirculating laser tube cooler using desktop PC water cooling components[2].

Beyond board games, they're useful for making tools for other projects. Need a drill guide with precise spacing? No problem, cut one out on the laser cutter. Need to prototype a coarse-pitch circuit board but don't want to wait for OSHPark or pay for a quick-turn fab? Ablate black paint off a Cu-clad board and chemical etch. Want to de-cap IC packages? You can, with some care. Interested in prototyping microfluidic structures? Sandwich some cut sheets of double-sided tape between acrylic sheet. Need to make a quick enclosure for a project? Design a box [3,4]. Cut the sides out of acrylic, and bond with dichloromethane (with ventilation!). It's great for making fixture components for things like robotics since you an easily include holes for machine screws.

They're also fun for cutting leather, cloth, etching aluminum laptops, making gifts, etc.

If you don't have access to nice commercial CAD software, DraftSight is a free AutoCAD clone that works fine for 2D drawings[5]. Otherwise, Inkscape works well for 2D, and for 3D, Rhino[6] has an affordable educational license that permits commercial use.

1. https://fslaser.com/Products/Lasers

2. https://github.com/tomkinsc/Laser-Cooler

3. http://boxmaker.connectionlab.org/

4. http://www.makercase.com/

5. http://www.3ds.com/products-services/draftsight-cad-software...

6. https://www.rhino3d.com/

[elihu]

I have their 5th-generation machine (now just called their "H-series" machine) with the 45 watt upgrade, and am pretty happy with it so far. Their software has a few quirks, but nothing I can't work around.

[borgel]

Great, thanks!

[jkaunisv1]

I've got a Full Spectrum Hobby 5th gen (20"x12" bed). I'm very happy with it, but the build quality is not as good something you'd get from Epilog. Of course, it's a significant fraction of the price, so it's worth it for me.

[bmsleight_]

Wow - Great way of generating Carcassone tiles. Thanks for posting. (Runs off to hackspace with files in hand)

[tomkinstinch]

Thanks! JavaScript manipulates the SVG files. That's one file type usable by the laser cutting machine. Due to how the machine operates, it's a mixture of vector cutting lines for the fine lines and tile edges, and bitmap images for the raster fill and shading. The vector lines are easy to change in color by adjusting DOM attributes, while for the fill images I change the colors on a pixel-by-pixel basis before spitting out the finished SVG files in a client side-made zip file.

This was helpful because beyond the laser power settings, it took some fiddling to get the right shades of gray for cutting depths that worked with the multilayer plywood I was using (some layers are darker than others; had to make it look good). The files can also of course be colored for printing.

The different regions are segmented by their colors in the original files, which were created via Inkscape with outline vector lines over bitmap fill images. The lines were drawn by hand by my girlfriend and I using Inkscape, based on a purchased copy of Carcassonne we have. The images were made by rendering the outline SVGs to PNGs, filling in regions using GIMP, then reimporting them into Inkscape, and overlaying the vector outlines.

For meeple, she laboriously cut them out by hand from Sculpey clay. A cookie cutter would have been ideal but it took her less time to cut the figures than for me to bend copper flashing into the shape of a person or to devise a way to extrude the figures.

Also, in case that URL goes down, here is a link to the tile generator on GitHub pages:

https://tomkinsc.github.io/carcassonne-shading/

[bmsleight_]

Very cool, I´ve seen other sell them:- https://msraynsford.myshopify.com/products/carcassonne-tile-...

Cool use of javascript.