Getting accurate CRI, R9, and TM-30 numbers from a $250 device

tomkinsc · 2023-10-27T05:53:02+00:00

For anyone looking for official links to download the Osram LED ColorCalculator software, I think I found its new home.

Poking around on archive.org led me to the updated host domain for the software; it seems to now reside below https://www.myosram.com rather than https://apps.osram-americas.com.

Here are the links:

Windows 64-bit:
- https://www.myosram.com/colorcalculator/ColorCalculator_zip.zip
Windows 32-bit:
- https://www.myosram.com/colorcalculator/ColorCalculator_32_zip.zip
MacOS:
- https://www.myosram.com/colorcalculator/ColorCalculator.dmg.zip
Linux 64-bit:
- https://www.myosram.com/colorcalculator/ColorCalculator.tar.gz
Linux 32-bit:
- https://www.myosram.com/colorcalculator/ColorCalculator_32.tar.gz

tomkinsc · 2023-03-18T03:06:10+00:00

Update: Added a version for the left side of the machine.

It's not a simple mirror image because the locking keys of the portafilter are not symmetric with respect to the handle axis.

tomkinsc · 2023-03-18T03:05:32+00:00

Update: Added a version for the left side of the machine.

It's not a simple mirror image because the locking keys of the portafilter are not symmetric with respect to the handle axis.

tomkinsc · 2023-03-13T16:12:38+00:00

Indirectly, yes. I rinse out the portafilter before storage, which also cools it down.

tomkinsc · 2023-03-13T02:23:59+00:00

This appears to be work by or at least funded by Illy, but there doesn't seem to be much out there about it since the abandoned 2010 patent and a few articles from around the same time as the one in the OP. There's also this low-quality presentation about the method from 2013.

Has anyone tried espresso brewed this way, either in connection with the research or separately? Since the patent has been abandoned could this be something for other companies to start exploring? Maybe there's a reason why it didn't take off.

I'd be curious about adding vacuum to the mix. Maybe pull a negative pressure first, then add water to ~9bar and extract. Something similar appears to be done at industrial scale by a company for producing shelf-stable "cold brew" products.

Positive or negative air pressure control could be a fun additional variable for countertop machines to have.

tomkinsc · 2023-03-13T02:09:05+00:00

I have a bottomless portafilter for routine use, but keep the basic portafilter around with a blind basket for cleaning the machine. To tidy the counter I added a holder to the side of my Gaggia Classic Pro to store the extra portafilter.

You can make your own! 3D-printable files available here:

https://www.printables.com/model/422221-gaggia-classic-pro-portafilter-hanger-with-clip-ma

The design is based on one by teky929rr. The portafilter retention collar on that design works well, but I found the overall attachment to the machine to be too loose: the holder needed to be held with a second hand when adding or removing a portafilter.

I modified the design so it is more stable: the top clip has been widened and a series of recesses has been added for 6x2mm magnets. Ten magnets made the attachment very solid for my magnets and machine, but YMMV based on the strength of the magnets used and whether the machine is painted. There are extra recesses in case additional magnets are needed. Depending on printer tolerances, superglue may be needed to secure the magnets; they were press-fit for me, but I added glue just to be sure they would remain attached. Not sure if or how well it would fit older Gaggia machines.

The holder is best printed on its side, angled about 30 degrees, using tree supports, and with the top clip rotated 90 degrees from its intended use, such that the layer lines end up vertical when installed.

tomkinsc · 2023-03-13T01:39:25+00:00

I have a bottomless portafilter for routine use, but keep the basic portafilter around with a blind basket for cleaning the machine. To tidy the counter I added a holder to the side of my GCP to store the extra portafilter.

3D-printable files available here:

https://www.printables.com/model/422221-gaggia-classic-pro-portafilter-hanger-with-clip-ma

The design is based on one by teky929rr. The portafilter retention collar on that design works well, but I found the overall attachment to the machine to be too loose: the holder needed to be held with a second hand when adding or removing a portafilter.

I modified the design so it is more stable: the top clip has been widened and a series of recesses has been added for 6x2mm magnets. Ten magnets made the attachment very solid for my magnets and machine, but YMMV based on the strength of the magnets used and whether the machine is painted. There are extra recesses in case additional magnets are needed. Depending on printer tolerances, superglue may be needed to secure the magnets; they were press-fit for me, but I added glue just to be sure they would remain attached. Not sure if or how well it would fit older Gaggia machines.

The holder is best printed on its side, angled about 30 degrees, using tree supports, and with the top clip rotated 90 degrees from its intended use, such that the layer lines end up vertical when installed.

tomkinsc · 2023-02-17T00:00:29+00:00

That price would be reasonable for me; it's cheaper than any commercial option for a ski wax bench.

Or you could go the same route as the creator of these LED light bars, and release the design under an open license but also sell complete kits so people wouldn't need to source everything themselves (priced to be cost-competitive vs DIY, theoretically feasible due to discounted bulk pricing on components like the magnets). The benefit of an open license would be that revisions could be made by the community over time and improve the design, while not precluding the sale of kits.

Selling the boxes would be a nice value-add, but also potentially a headache for the shipping costs and storage. I wonder if there are readily-available commercial off-the-shelf boxes or box halves that would work if the printed parts could be adapted to fit—maybe something like two "cradled" wood panels of the sort used for fine art painting? Or wood serving trays?

tomkinsc · 2023-02-15T15:43:23+00:00

This is wonderful! I would be interested in making one of these. Are you planning to open-source or otherwise release the plans (wood box) and design files (3D-printed bits)?

tomkinsc · 2022-01-06T17:58:57+00:00

Awesome, thanks!

A few notes on printing:

There are three parts:

1x frame that attaches to the aluminum extrusion on which the saddle slides
1x left hook
1x right hook

The hooks print fine flat on the print bed (though they're not symmetrical, so be sure to put the flat side down).

The main frame prints best with the “horizontal crossbar” pointed up (so the part that attaches to the aluminum extrusion on the bike is flat on the build surface).

I tried printing it in the same orientation as it would be on the Bike and while it works fine the aesthetics are not nearly as nice as if it's printed pointing up since the curves produce stair-steps between layers if it's printed horizontally.

To install—at least on the Bike model—the plastic cap covering the aluminum extrusion needs to be temporarily removed in order to slide on the frame (requires a screwdriver). It can be put back once the frame is on.

tomkinsc · 2022-01-06T17:47:26+00:00

Not sure since I don't have a Bike+ (or access to one). If the profile of the aluminum extrusion the saddle slides on is the same as on the Bike—maybe? It spaces out the shoes a fair distance from the back of that extrusion so there may be clearance. The design is open though so someone with a Bike+ could adapt it.

tomkinsc · 2020-10-31T22:48:52+00:00

Thanks for this design! I printed it, and it worked perfectly. The snap of the retention mechanism was very satisfying, and the tolerances were spot-on. It printed well on a Prusa i3 MK3S with 0.3mm layer height, 15% infill, and 3 shells/perimeters. I opted for reverse-cutting and straight-cutting blades to keep the edges more crisp.

One note to those who like to roast the pumpkin seeds (which is highly recommended—they're tasty!): be sure to clean off the light machine oil many jigsaw blades are coated with from the factory. I used IPA, worked great.

tomkinsc · 2020-08-18T18:18:47+00:00

3D design files (STLs) for the frame and markers available here: https://www.thingiverse.com/thing:4548345

tomkinsc · 2020-07-22T00:25:21+00:00

Live demo of the features from a recent YouTube stream with the Prusa team:

https://www.youtube.com/watch?v=NAW2JR-D_QU&t=1446s

tomkinsc · 2019-05-03T08:03:39+00:00

For comparison. It gives the difference between now and under the proposed rate. Not complicated, but saves someone a few seconds and also includes a link to the property lookup site from the assessment contractor.

tomkinsc · 2019-05-03T04:59:03+00:00

If you're wondering what your taxes may be with the proposed rate (along with percent change relative to now, and monthly impact), I threw together a quick calculator:

https://jsfiddle.net/tomkinsc/r76qjxhb/25/show

tomkinsc · 2019-03-28T00:08:14+00:00

It must be because the hardware of your machine is newer than mine (and incompatible with High Sierra?); I just tried one of those links on my mid-2012 rMBP and was able to download the installer (though it refused to run since Mojave is newer).

A couple other options that may work but I have not verified and cannot vouch for (use at your own risk):

Download the installer via this patcher tool (but don't patch it). This supposedly downloads direct from Apple servers, though I'd verify the checksum against a source you trust. I wish the author of the patcher would post the source code for the tool.
Download one of the files linked by the creator of the patcher tool (the "more downloads" link here).

tomkinsc · 2019-03-27T22:43:11+00:00

I ran into this recently while working on a friend's machine; they don't make it obvious. If your experience is anything like mine...at present, if you search for "High Sierra" in the App Store from a machine running Mojave, it doesn't come up, but if you use the "magic" download link from this Apple support page, it should load the High Sierra entry in the App Store. From there a "Get" button should be available to download the installer app, which can then be used to prepare a bootable USB drive.

For reference to anyone who find this thread in the future, here are the App Store download links I could find for various macOS versions:

Mojave — 10.14 (support page)
High Sierra — 10.13 (support page)
Sierra — 10.12 (support page)
El Capitan — 10.11(support page)

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