Tawe TMD blog is live

This is a blog for Tawe TMD thingummybobbins.  Also, all my SLA 3D Printer Project posts will reside here from now on.

SLA 3D Printer Log 1: Projection, Projection...

In between dreaming of a house where model trains bring me pre-mixed Robinson's squash and keenly observing the cathartic tidal wave of backlash against Dungeon Keeper Mobile I have received a 720p projector from Ebay, costing £250.  Before launching into the specifics of how to use it, let's examine the unit itself.

The book is A4 width (and 2cm shorter lengthways) for comparison, and the unit weighs 1.13kg

The unit is actually 206 x 162 x 75mm (lxwxh), feels like a quality implementation despite it's low weight and is highly intuitive to operate; this isn't surprising when we learn that this model (Nobo X22PW) is simply a rebranded Optoma TW330, which is going for £410 at time of writing.  That is excellent value for money given that most projectors in that range will be 1024x768 native at most, not 1280x800 native (keep an eye out for native resolution, most projector sellers claim their model will "handle" 1080p, but this is done through upscaling and will make your movie look anything but sharp).

*Review Interlude*

The unit is surprisingly quiet in spite of the fan having to keep a 2200 lumen lamp from exploding (not a hint of facetious here), and that lamp gives plenty of brightness even on std-mode with 1700 lumens.  It is audible, but it quickly fades away during gaming since the noise has no irritating frequency (that goes out the window in bright mode, I suggest just turning up the brightness in windows).  Having played Medal of Honor: Airborne on it I can say that it eco-mode might not be to everyone's taste but with lamps costing around £90 I think most can sacrifice 29% brightness for 66% more lamp life.  This is also a Single-Chip DLP model so it suffers from a little colour separation during fast motion (highly noticeable when you shake your head viewing a black background); finally I would like a better contrast ratio than 2000:1 for more defined extremes in the colours, but I'm rapidly disappearing down a rabbit hole here.

*End Review Interlude*

Back to the point at hand, 1280x800 will allow for a detail level of 0.1mm per pixel for a build area of 12.8cm x 8.0cm; I'm looking for a minimum resolution of 0.05mm seeing as I design for FUD on Shapeways (0.1mm Resolution), giving a build area of 6.4cm x 4.0cm.  One of my ideas up to this point was to traverse the projector along a vertical rail, utilizing a redundant RAMPS axis to adjust the build area/resolution balance, but I forgot to account for projector focus; what's worse is that the minimum distance I could get the projector to focus was around 28cm, which gives an image of 197.5mm x 124mm - well above the 64mm x 40mm required.

Despite this, the brightness of the resultant screen area was highly encouraging.

In order to attain this build area, I need to add an adjustable lens with at least 3.0x magnification.  DSLR lenses can be had used for around £50, given that a UV filter is a common accessory it may be that the lens can transmit UV without hindrance, but apparently DSLRs have UV filters of their own and there may be some in the lens too - an optical testbed will be required to fully investigate the matter, as well as some actual 3D resins (no VOCs, please).

Free Ideas Bucket 1.0

I intend this project to be completely open-source, that means any and all STLs and diagrams related to the build will be available royalty-free and not on my Shapeways Shop; if *you* would like to sell it, go ahead but be prepared for a hard time making money given that the models are free and Shapeways can be used by a Bonobo.  Anyhoo, I present my current list of ideas:

• A standalone built-in computer, either a Raspberry Pi, it's more powerful compatibles or even a full-on x86 PC.  This is to allow the printer to run without having to keep either my PC or Laptop running with it all night.
• An ultrasound sensor to detect the resin level in the bath and adjust the build platform starting point to suit, this is only relevant to top-down designs.
• A touchscreen on top of the machine, adjustable to either face outwards (for desk use) or upwards (for floor use).
• Gullwing doors...  just because...

That concludes the first of hopefully many buildlogs to the SLA 3D Printer Project.  The ultimate aim is to largely free me from having to use Shapeways for every.  single.  solitary.  step.  in the R&D Process for Tawe_TMD.  It's always the way when you make something that you trip up on things you couldn't have predicted, but even if I flounder and fail, I can always watch Zero Punctuation across my wall.

Sirens of the 1080p screen, and the prints of reason.

As far as temptation goes, getting a new PC is up there with crisps positioned but a few feet away after 3 hours of CAD.  I say temptation because my current aim (and New Year's Resolution mind you) is to be able to subsist upon my own business alone - not to have to rely on a job to pay my bills.  I have already made inroads towards this with my Shapeways Shop Tawe_TMD but I've hit a snag:  Research and Development.

I am currently developing my first proper product, which is a Metropolitan Ex-Twin Brake Van from the turn of the century in N gauge (1:148); the body is pretty much sorted out, pending any minor alterations for functionality.  The chassis also pretty much looks like the final iteration, so the bulk of the work is now done leaving me with the R&D associated with functionality - and boy was I in for a ride!

Each one of those strips on the side is 0.1mm high by 0.25mm wide.

In the UK it takes around 3 weeks from order to delivery, in the latter stages of R&D (tweaking) this holds true even for minor changes like increasing the distance between the axle holes; this is doubly frustrating when a mistake is made, such as an item being wrongly printed, this being the direct inspiration for this post and the potential project I will get to in a moment.  Shapeways solved this issue with haste and care and I applaud them for such attention, however, I consider it a call to action for a proper solution.

That solution is my very own SLA (Photo Lithography) 3D Printer; this isn't as difficult as it sounds, because according to many Youtube videos and This Instructable, it is entirely possible to print a 3D object using nothing more than a Z-carriage, a beaker of resin and a DLP Projector.  Feature sizes can be minute, too:  a 1280 x 800 DLP projector (£250 from Ebay) can result in objects up to 12.8 x 8 cm in size with a resolution of 0.1mm in the X and Y; you can even get higher resolutions simply by reducing the distance between the Projector and the resin (e.g:  6.4 x 4 cm with and XY res of 0.05mm).

I have made a not-terribly-professional case study into this idea and found some interesting facets to the idea of running a 3D printer like this:

I was never noted for relishing writing novels...

For the record, here's some additional information for those looking to check all this out (I did this on many assumptions):

• 1 Metro Brake Van = 2656 mm³
• I set a budget of £200 for materials, this includes minor electronic items like stepper motors, and any 3D prints for special parts.
• I don't know what I will coat the build platform with, but it will need to hold things during printing whilst peeling off when done.
• I assume Council Tax to be included with the Rent.
• Food + Taxes is broken down thus:

1. Food = £30/week or £120/month
2. Income Tax = £38.12/week or £165.19/month from here (assuming gross earnings of £15,000 a year)
3. The rest is for other things like electricity, gas, water which I can't be stuffed to calculate, but the remaining £164.81 should cover it

• As for printing, I am assuming a perfect run of setting up supports (SLA prints need copious support material, maybe not in the case of the Metro Brake but I'll apportion it anyway), a successful print owing to a reliable non-stick application (that's what the Sylgard 184 is for - It stops the print from adhering to the resin basin in bottom-up designs), and finally a flawless post-processing run (fat chance...).

It is quite clear to me that running this printer to print Metro Brake Vans to sell is not a viable proposition - even with sufficient resolution, the time spent in preparation will ensure absolutely no free time, an unacceptable situation when this business is intended to help me achieve financial freedom.  3 hours per print sounds low compared to 3 weeks, but remember that Shapeways is taking on all the work in those weeks, and I am free to make new designs while my Metro Brake goes on sale.  This printer makes much more sense for Functional Testing, i.e:  making minor changes around the coupling area or testing strengthening ribs.

To any aspiring Shapies, I say this:  If you have passionate pride in your work, be prepared to test and test and test - go so far as to intentionally break your redundant testing models to reveal weaknesses.  On the note of final presentation, don't be like many of the modellers on this virtual superstore of human creativity and only upload the STL with some token renders; this really shouts "That'll do, next!", and is that the attitude you would tolerate from a carpenter?  An engineer?  A NEST team?  One of the best ways of showing that you have done such testing is to upload a Youtube video that will show it running.

I hope that PC temptation doesn't get the better of me...

"We're still here if anyone cares!" - minor updates

This is pretty much just a micropost with a few updates wrt blogging matters, done just to keep this page updated while I stall for worthwhile content.

• I have made leaps and bounds in progress on my carriage, go here for comprehensive updates; point is it shipped today after 5 days(!), apparently will be with me tomorrow (it's currently in Eindhoven, NL).
• Perks for Pocket Change could see the light of day, but that's in doubt; so if anyone wants a catchy name for a similar series, here you go - I promise I'm no patent troll.
• I may do some videos on youtube at some point, but expect little to no speech, since my vocals provoke entertainment in the same way that Coppercab's hysterical nonsense provokes rational debate.

That's that.

Canals and Curious Carriages

Progress is slowly being made in Tawe_TMD - Bearing in mind that I am on a Student's income so leaps and bounds are not to be expected, at least not initially.  I have decided after many pilot runs uploading models of bunkers to my Shapeways Page, I have decided to get one step closer to my ultimate aim of locomotive kits and begin work on a Railway Carriage in N gauge:

Creo Elements/Direct is like Pro/ENGINEER without a price tag :)

This is a Metropolitan Line 8 Wheel Non-Bogie Carriage, originally working the aforementioned line on the fledgling London Underground until 1909 when they were sold to the Burry Port and Gwendraeth Valley Railway for it's own passenger service.  These had eight wheels with a total wheelbase of 28 feet or 8.53 metres which given the sharp curves of a line built on the route of an old canal (Wales' oldest one, no less) would have presented a problem if it were not for it's chassis; the inner 2 axles were fixed to the frames, but the outer 2 axles were mounted on radial trucks with their pivots above the inner axles, similar to locomotive practice.  Incidentally, these carriages had brakes on the inner wheels only as a direct result of this.

The model is far from complete, with side details missing and a lack of a chassis (this will be a seperate unit to allow fitment of an interior and to allow flexibility for future conversion to 2mm finescale); also the roof is a bit crooked at present so I will need to address that.  Other than that, progress has been good with me picking up Creo nearly effortlessly due to muscle memory and experience with Pro/E and I think we could have a physical model to show off by mid-June, early-July.

Hope you enjoyed that  :)

Sources:

1. The Burry Port and Gwendreath Valley Railway and its Antecedent Canals Volume Two:  The Railway and Dock
2. Wordpress:  The Basilica Fields blog

Shapeways: Incidental thoughts on my new faith

The arrival of my stunning new items from shapeways has prompted me to post about it...  nope, that's a lie - what actually prompted me is a stray thought from my grasshopper mind which goes like this:  Many women say there are no good men left, equally many men claim there are no good women left; so what is stopping us from outright saying "all people are bastards and that's all we are!"?  The answer may be obvious, but hold that thought...

Anyway, onto the matter at hand, my reception of my first 3D printed objects from Shapeways, my new temple :)

Yep, that clear plastic bunker has fire ports and stairs!

I won't go into too much detail about these objects since I have them for sale on shapeways here:
http://www.shapeways.com/shops/Tawe_TMD
Nevertheless, I feel it necessary to divulge my future plans for Tawe TMD in terms of 3D printing:

Short Term Goals

1. Add many buildings to my site - at 10% markup a €15 building fetches around €1.50, though stock does not present a problem since the storage is digital and models are made to order, so even I can eventually build up quite a collection of 'stock'
2. Add some actual train models - this is where I really want to go with Tawe TMD, producing locomotive body shells at first, moving on to making chassis parts and eventually entire kits, which will probably be sold though my Ebay shop
3. Add R/C aircraft parts - I have an idea for a side business where I make plans for R/C aircraft costing around £5-10 inc P&P, perhaps even free to download; then I can host the detail parts on Shapeways so that model builders may, if they choose to, add detail to their aircraft

As you can see, I fucking worship 3D printing now, I think of the days when we can print our own stuff like bicycles, cars, houses, perhaps even lovers?

Yeah, lovers which we can print out around an android shell with the body type and assorted features we fetishize.  This brings up a bizarre and potentially dangerous thought:  What will happen to human sexuality when love-droids become both ubiquitous and fully customizable?  Will we stop mating with real humans and send our gametes to an organization which not only births the children, but raises them too?  Blimey, that is a terrifying thought, especially when politics wade in...

Told you I was grasshopper minded ;)