Apparently there's a new release? Morrissey or something?
Stretch your legs commanders!
Making a Remlok Space Helmet - Part 9
With my new supply of clear resin, I had printed the second half of the front visor. Now I needed to sand and polish the section before resin-welding the two halves together.
This involved a number of ever increasing grit sandpaper and a large bowl of water. Wet sanding has the added advantage of keeping the resin dust from killing me. Which is nice.
I then kicked off the second half of the rear dome printing, to run overnight.
While that was printing, I welded the front sections at last.
This is going to need more sanding before it's finished.
Next morning the rear dome had completed printing, so after removing all the supports and washing and curing the part, I then taped it to the other half to hold it in place while resin-welding. This time I sanded AFTER welding, for a cleaner finish.
The result so far is pretty good. I am now waiting for some drill sanding attachments with a range of sanding grits from 80 to 3000 (very very fine). I am going to test these on the rear dome and if successful, apply them to the front visor too.
Currently the helmet is all welded together, so I am now turning to the electronics. I plan to put blue LEDs in the ear muff and an LED strip under the cross piece.
Part 8 - Shiny
After a long break, I was in a position to purchase a volume of clear resin to resume printing the Remlock visor. In the interim I had managed to sand and polish the left half I had, to successfully make it optically clear. Not perfect, but good enough for cosplay.
Yesterday I set the right-front half printing and it ran overnight.
By the time I got up this morning, it had finished and unlike the last attempt that ran out of resin, this one was perfect.
I washed it in isopropanol alcohol and cured it under UV lamps after removing all the supports. Then I set it on the other parts to check the size was okay. One of my cat co-pilots (Charlie) approved.
You can see the difference between the polished section and the newly printed half. I now need to resin-weld the two halves together. This is done with a brush dipped in resin and a UV torch. I plan to do the sanding and polishing first, then weld the parts.
Since I obtained my 3D printer, I have periodically printed one or two Elite: Dangerous ships out. Sticking with the scale 1:1000 (1mm = 1m) it has made the size of the ships really stand out.
If you compare the Type-9 Heavy with the Sidewinder the size difference is astounding; what's more, the Sidewinder carries an SRV which is itself, the size of a Range Rover!
As my 3D fleet began to assemble, I gave some thought to where to store and/or display them. Glass cabinet with them all painted gold? Hung from the ceiling on fishing line? Big shelves? None of these options really appealed.
As part of the 3D printing process, the models are hollow and have a "drain hole" in the bottom to let excess resin drain out during the washing stage. My idea was to create a display stand that plugged into this hole. That idea didn't go so well, as a stand per model meant a pretty large shelf. As you can see in the photo above, even jammed together the ships I've printed already cover a 2m window ledge.
Then I thought "Why not mount them on a blueprint?", so I tiled (printed across multiple pages) an old CorelDRAW size chart out to see how it would look.
Not too shabby, but this poster was out of date. Also, I don't have room for too many A0 posters in my study. I was loath to glue my models to a poster as I might want to play with them after all!
Instead, I found what I hope is a better solution. Small Neodymium magnets that can be glued into the drain holes of the models, a poster printed at A3 with one poster per ship manufacturer, with an adhesive magnetic sheet stuck to the back.
I have hammered out a design I am happy with, which just leaves getting the posters all done, sent off to be printed, adding the magnetic backing and fixing magnets to the ships.
Then as I finish printing the remaining ships, I just need to add a magnet and stick them out.
Part 7 - mirror mirror! Seven years bad luck?
Last night I sliced the rear dome in 3D Builder and added pin holes for alignment. Then I loaded up Lychee slicer and made a print file for the left side and set it printing.
This morning, I took the print off the print bed and found a problem. It had printed the right side.
Assuming I was just an idiot I rechecked the model and Lychee, both showed left-hand models, but the print icon showed (clearly) a 3D model that was the right side. It looks like a bug in Lychee that any model mirrored in the application is printed back in it's original orientation.
In the meantime I popped the rear-right half dome onto the rest of the helmet and just propped it up to see how it will look.
The front-right visor (I checked three times before hitting print) is now started. See you in 12 hours or so...
Amazon delivered the higher grit sandpaper, so I have got busy after supper this evening and it it looking reasonably clear. Obviously I haven't done the entire section and there are three other sections to sand and two that haven't printed yet. Lots to do!
Part 6 - Can you see?
Wednesday morning after feeding the kittens, I checked on the print. It looked awesome.
However once washed and cured, the visor had become a little cloudy. This is caused by oxygenation of the resin. Over exposure to UV also caused yellowing. So there are a number of problems to address. One suggestion is to add a little blue dye to the resin to prevent yellowing. The suggestion of curing the model under water to reduce oxygenation is impractical as the visor part is way too big for any container I have and none would fit in the curing station either.
Anyway, the (now proven) method is to repeat sand and polish the resin to a clear finish. I have ordered some various grade of sandpaper and some turtlewax polish compound, so that will be my next step. Currently it's a case of cloudy with chance of RemLok!
Part 5 - resin or vacuum forming?
The visor for the helmet is in a number of sections. All of these are twice the size of my print area. This means I have two options. One, I print a set of former pucks (as suggested by CMDR Antonia) and vacuum form some plastic over them to make the visor. Two, I print the visor model in translucent resin. This comes with several issues, the main one being size - I will have to half all the parts then weld them after printing. Another issue is resin is transparent, but a little cloudy; fine for "glass" statues, but not much use for an optically transparent visor. To fix this you need to sand and polish the resin to a clear finish.
To test this I first had to buy some translucent resin. I then chose a small "glass" model I could print and test to see how hard or easy it would be to get transparent. This was the result.
With some painted caps and little alcohol ink, the results were excellent.
Having proved the concept, I went on to halve the front visor model and add some pin holes for alignment, so it would be easier to assemble.
I set it printing and came back twelve hours later...
Part 4 - getting your paint on
I had done some sanding and smoothing on the helmet and felt the main assembly was complete enough to paint. I gave it a coat of black primer and then with some key areas masked off, applied a second coat of chrome.
The masking tape worked with mixed results, however it did serve to give the paint a "worn and scratched" look. I then added a coat of Plasticoat clear to finish.
Part 3 – welding with a jig
In order to ensure the ear muff, jaw pieces and rear top section all join act exactly the right angles, CMDR Antonia had modelled an alignment jig. I printed a left & right jig during the day and then in the evening put all the parts from one side into their respective jig and carefully welded them together with spots of resin and the UV torch. Once the parts were fixed, I removed them from the jig and added a thin application of resin in all the cracks and joins, effectively making the parts a single piece.
With that done, I printed the rear cross sections. Again I needed to print these in two halves and then weld them together. This was getting easy now, so having done that, I welded the rear cross section to the main helmet.
Part 2 – rear top side-pieces and the cross member
The rear left and rear right side pieces were printed next. One of the STL models from Thingiverse was corrupt, so I just mirrored the good model and printed them both.
The cross member which is the bar that goes over the top of the helmet was my first real problem. It was considerably larger than my print area. To resolve this, I used Windows 3D Builder to cut the cross member in half and then printed it in two halves. Once printed, washed & cured, I used resin welding again to join the two halves. I could then assemble the pieces then for the first time.