3D printed bike

I assume you're referring to Adrian "carbon wasp" Smith
https://youtu.be/5gFyqFGtqsM

I think he's upped his game a bit since those days tho
last interview i read he was talking about printed moulds and custom silicone bladders

similar process to the instructable on previous page but with carbon frame tubes
https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=148513

Remind me why IS-mount calipers have disappeared again?

The main structural reasons for PM over IS is that the materials of bolt and mount are better suited to absorbing the braking loads into the fork or frame than with IS. The bolts themselves are loaded in tension which is where they're strongest but on IS mounts they have to deal with a shearing load which is where they're actually the weakest. PMs also require less material to be used in the frame/fork construction and so you end up with marginally less weight. I believe when Fox went from IS to PM in 2008 they claimed something like an ounce of weight reduction in the lowers.

https://www.pinkbike.com/forum/listcomments/?threadid=127672

That's all well and good, but surely if you're using a PM caliper with an IS adapter you're negating both the advantages listed?

Yes, but it would have solved the problem of the stays being nowhere near the mounting points of a PM caliper. But instead of that Phil came up with a more practical solution, cutting up a PM braze-on:

About the same effect as the 3D printed solution I posted but a lot less involved for me, lots of filing for Phil though. This and more fun in my current projects thread.

Much better!

I've always been turned off by the optical clusterfuck of IS>PM adapters, bolts, concave/vex washers etc. The above looks very elegant given the constraints of a boost frame.

Spencer Wright (Founder of the rather excellent weekly newsletter 'The Prepared') did a couple of interesting reports on a Ti-printed mast topper
http://pencerw.com/feed/2015/3/15/3d-printing-titanium-and-the-bin-of-broken-dreams
http://pencerw.com/feed/2015/8/6/3d-printing-titanium-learning-to-learn-from-success

The same guy used nTopology to create a top cap weighing 4g
http://pencerw.com/ti-top-cap/batch-one-ti-top-caps

More info here https://www.bikeradar.com/features/the-140-3d-printed-titanium-top-cap-that-i-cant-help-but-love/

There was also talk of a stem too

https://pencerw.com/feed?tag=stem

Continuing the theme of superlight Ti widgets here's a printed chain catcher (weight: 10g) from Garmin mount specialists and general AM-evangelists Raceware direct

Available from their online shop for a princely £30

Interesting possibilities for those with home printing:

https://scitechdaily.com/move-over-plastic-desktop-3d-printing-in-metal-and-ceramics/

If you get EAA (Experimental Aviation Association) membership at $40 a year you can get a student copy of solidworks premium for free. Obviously its non commercial but it's helped me a lot in fixing various bits and bobs round the house with my printer.

Yes, worth keeping an eye on to see if the filaments become a bit more affordable.

The BASF version's still pretty pricey - https://3dgbire.com/collections/filaments/products/ultrafuse-316l-metal-filament-2-85mm-3kg?variant=32277325348917

I don't know how the thermal process works to sinter that Tiwari product but for the BASF version you have to ship the 'green' part to one of their partners for curing.

https://www.matterhackers.com/store/l/basf-ultrafuse-316l-metal-composite-3d-printing-filament-175mm/sk/MRDKJRRS

this is good to know.
Are there any restrictions to a student version of premium?
Does it still watermark your 2D drawings?

wow thats awesome i did not know that. Thanks! will check it out

Yeah unfortunately it still watermarks drawings and has a pop up when opening part files. But you do get access to the simulation and CAM packages.

yes they don't like cheap/free licenses ending up in commercial use...good to get the simulation tho - is the FEA for single parts or assemblies?

Recent article on Sturdy - https://www.3dprintingmedia.network/sturdy-cycles-works-with-ram3d-on-production-of-custom-titanium-bicycles/

fully printed headtube - they've even gone to the trouble of polishing them

more pics here: https://www.ram3d.co.nz/sports-performance (print bureau)

printed forks tho

Those hourglass thingies look like material testing samples? If so he’s really taking things seriously.

well spotted, yes and they can record young's mod or fatigue strength or whatever specific to each lug set

At the Advanced Engineering show at the NEC last year, I think it was
Renishaw had 3D printed polished Ti bars on display

Was this the sprint version?

or was it the hope/renishaw project where it goes straight onto the fork crown

I've seen this in the past and I think it's stunning. I'd love to see some in depth evaluation of stiffness, weight, durability etc vs conventional lugwork.

Yes, me too.
As with all optimised geometry, form is driven by loading case.
With all the development of optimised carbon fibre frames presumably there's data describing flex during sprinting, deflection on crank strike or what happens when the bike falls over etc, but you could imagine scenario in which something so heavily optimised and directional in strength could fail in an unforseen loading scenario...