Cherry picked Planet Reprap - A RepRap blog aggregator

September 04, 2015

New reprap images on Photobucket

Thingiverse - Newest Things

Peeler tool BŐRNER repair

You can use the blade of a broken peeler

by yryry at September 04, 2015 02:15 PM

Pharaoh Nectar Bottle

Imagen you are on the Nile river with your pretty princess drinking nectar from this bottle!
size 170x170x240
Pharaoh Nectar Bottle.
no support structure needed

by braveheart at September 04, 2015 02:10 PM

Thingiverse - Newest Derivatives

Dondolo Extruder Mount for ORD Hadron

I designed this bracket to attach the Dondolo dual extruder to my ORD Hadron. I have yet to test it on my machine, but the mounting holes are accurate and it should work. You may need to adjust your y-axis makerslide further forward because the extruder extends out from the x carriage further than a Wade's extruder does. See "Instructions" tab for tips.

This is a drop-in replacement for the Prusa x-carriage, no other parts need to change for this component to allow mounting to the Hadron default carriage.

by Fragmaster at September 04, 2015 11:41 AM

Onda Longa 60 teeth pulley

This is a 60 teeth pulley compatible with 9mm to 15mm HTD 5 belt.
It is designed specifically for the ONDA LONGA Longboard.
I just printed it and didn't tried it yet, waiting for the matching belt.
It will have a ratio of 4:1 with the 15 teeth motor gear.

by Tartopom at September 04, 2015 11:09 AM

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September 03, 2015

Recent Uploads tagged reprap

3d printed stein 2

Ke7dbx posted a photo:

3d printed stein 2

A 3d printed stein of my own design. I may cast it and make a ceramic or pewter version in the future.

by Ke7dbx at September 03, 2015 08:38 PM

3d Printed Stein

Ke7dbx posted a photo:

3d Printed Stein

A 3d printed stein of my own design. I may cast it and make a ceramic or pewter version in the future.

by Ke7dbx at September 03, 2015 07:18 PM

September 01, 2015

julianh72's Blog of Interesting Stuff

More musings on EnChroma sunglasses for colour blindness

It was a pretty big decision for me to go with the EnChroma sunglasses without having the opportunity of trying them first, but there are no dealers in Australia at present. However, I did a fair bit of research first, and took some comfort from the 30-day money-back guarantee (which I won't be using!)

I don't want to disparage other glasses which are advertised as enhancing colour blindness, as they may work well for many people, but I tried another brand a few years ago, and they didn't have a huge effect for me. (The EnChroma lenses are chalk and cheese in comparison for me). With respect to the technology aspect (narrow-band "notch" filters vs. "broadband" dye filters) - I don't know whether the benefits of narrow-band filters will apply equally to everyone, and I don't know whether any of the other brands are now using narrow-band filters - their website aren't always clear on the exact filter technology being used.

Narrow-band filters (as used in EnChroma) cut out a very specific "notch" of wavelengths (colours) while allowing very similar adjacent wavelengths to pass almost unaffected. Broadband dye filters (which is what the brand I tried previously  USED to use, but I am not sure about now) generally suppress a range of colours, but then a have smooth "shoulder" of rising transparency for the adjacent colours that you want to pass - think of it as a sheer-edged canyon versus a smooth river valley.

If I make a rainbow spectrum with a glass prism and look at it with the EnChroma lenses, there are two distinct dark lines in it, one in the Blue end, and one in the Red-Green end. See this shot which I took (yes, I'm a science geek!) which shows the effect:

I expect to see the same effect on natural rainbows (but I haven't seen any since I got the glasses) - they will presumably split into three coloured bands with a narrow gap between them.

I think this is why the EnChroma lenses work so well for me - the Red-Green "notch" drives a "wedge" between my Red and Green receptors, allowing my eye to see colours in the Red-Green range as either predominantly Red or predominantly Green, but it does have the side-effect of making a few colours that span right across the "notch" a richer, darker colour (drab olive greens and khaki colours tend to become richer in hue but darker).

The broadband dye  filters that I tried a couple of years ago don't have such a strong differentiating effect for me, but others may get a different effect (and they may have changed their lens technology in the last couple of years).

I think that the Blue notch in the narrowband  EnChroma filter is not particularly "useful" for enhancing my colour perception (as I am Red-Green colour blind), but it is also why some digital displays get a green cast - if the peak wavelength of the Blue pixel in the RGB display falls right in the "notch", then the Blue signal is heavily suppressed, and White on an RGB display with very little Blue signal tends to come out greenish. So far, it seems that some (but not all) outdoor digital signs have this effect, and OLED computer / phone / tablet displays in particular seem to have the effect, but LED computer screens and TVs seem to be fine. My guess is that the Blue pixel in those outdoor signs and OLED displays happens to fall right in the "notch", but other display types have a different spread of Blue in their RGB mix, so plenty of Blue still gets past on each side of the "notch".

I suspect that the exact narrow-band filter "notches" that EnChroma use on their Cx-65 Indoor / Computer lenses may be tuned differently, to avoid excessive tinting on digital displays (but I haven't tried a pair to be certain).

I haven't noticed any "weirdness" from the Blue notch in general viewing of "natural" objects - the sky is still sky blue, but maybe some very specifically coloured blue flowers might darken significantly? (I'm looking forward to Jacaranda season as a good test - Jacaranda trees in flower are an intense vivid colour to my unaided eye; I'll be interested to see if they change with the EnChroma lenses.)

by Julian Hardy ( at September 01, 2015 11:51 PM