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Rock Crawler

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Postby wibblywobbly » Sat Nov 11, 2017 4:35 pm

After looking around for something to build I have ordered an FTX rock crawler. I wanted something that I can do a unique bodyshell for, and after a quick bit of playing on Openscad, I knocked this up. It's 1/10 scale, so huge, but I reckon a Mars explorer suits the chassis etc.
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Postby Estnische » Sun Nov 12, 2017 10:42 am

Wouldn't that be awesome. Just need a 1:10 scale Major Matt Mason (without the broken wire armatures) or similar.

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Postby wibblywobbly » Sun Nov 12, 2017 10:47 am

Those are neat figures and I would love to have an interior with those in. Unfortunately, the interior is going to be full of chassis parts, battery and esc etc. I will wait and see how it all fits. :thumbup:
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Postby wibblywobbly » Sat Nov 18, 2017 10:04 am

The crawler is on my bench, but the white filament that I ordered to print a new shell hasn't arrived yet, so I set about adding a bit of detail to the original bodyshell.

The interior, drivers and rear deck are all a one piece injection moulded sheet. which look a bit 'blobby'. I decided to cut the engine out, paint the the drivers jackets, and re-do the engine and deck.

Then it was just print it, paint it, and attach it all. Looks a bit better now.

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Postby wibblywobbly » Mon Nov 20, 2017 10:18 pm

A reel of white filament landed on my doorstep so yesterday I started printing the Mars Rover bodyshell. Jeez...36 hours have elapsed, its printing at 140% speed, and it still isn't finished. It's going to use up the entire 1kg reel, so I have had to order another reel to print the rear bed. The CR10 has operated flawlessly, and Cura 3 is producing an excellent finish. I will have stacks of support filament to pull off, but the latest Cura now prints it so perfectly that it brushes off without leaving a trace of where it was attached to the structure.
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Postby wibblywobbly » Tue Nov 21, 2017 7:18 pm

Well that was a marathon, around 42 hours even with increasing the speed by 50%. It almost all went badly wrong, filament comes on 1kg reels, Cura told me it was an 850 gram print. So, I loaded a new reel on when I started this print, so that I had plenty of spare filament on the reel. I get to 11pm last night, the print is 90% done....but looking at the reel there was very little filament left on it? I had to stay up till 2am to make sure that it didn't run out before it finished, it was close, maybe around 1 metre left on the reel.

This means that either Cura isn't calculating filament use very accurately, or that the 1kg reels I am buying only hold around 850 grams of filament. I ordered another reel, and will deduct the weight of my empty reel from the weight of the full one...if the answer isn't 1kg then the company selling it will get a shirty message from me.

Anyway....this is the front cab and wheel inserts, and all in flawless quality.
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Postby midlife306 » Tue Nov 21, 2017 7:25 pm

Looks awesome!!!!!
Going to have to get myself one of those printers!
Any chance of a closeup of the lady in the background of the next to last pic?
Cheers
Wayne


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Postby wibblywobbly » Tue Nov 21, 2017 7:35 pm

Ha ha, I never realised she was there, I did her as a test print when I got the printer as it very demanding to print something like that, she turned out amazingly well which is a testament to the CR10. May I congratulate you on your fine eye for detail! 8O She may end up in the forces entertainment centre in a scenery diorama.... :angel:
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Postby midlife306 » Tue Nov 21, 2017 7:47 pm

Riiiggghhhtt


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Postby wibblywobbly » Thu Nov 23, 2017 4:21 pm

For those that have 3D printers and look for cheap filament off Ebay, beware of this outfit.

http://www.ebay.co.uk/itm/3D-Printer-Filament-ABS-PLA-1Kg-1-75MM-Roll-Pack-For-Huxley-Makerbot-UP-Leapfrog-/172580902628?

They are advertising standard 1kg reels of filament but there is only 800grams on the reel, the plastic reel and packaging weigh 200 grams. That's a 20% shortfall, so not only not the bargain that it looks, it can spell disaster if you are going to print something that requires 850 grams, load in a new reel and leave it running a oouple of days. The filament will run out and the 40-50 hour print will be wrecked.

I wish I had read their negative feedback before ordering...jeeeez....and Ebay allows them to continue operating?
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Postby midlife306 » Thu Nov 23, 2017 6:02 pm

This is the guy I use
3D Printing Printer Filament PLA 1.75mm 1kg/sample for Reprap Makerbot UK SA https://rover.ebay.com/rover/0/0/0?mpre ... 2759509714

Prints well & his deliveries are lightning fast.
I must have had 30+ coils from him.
Cheers
Wayne


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Postby wibblywobbly » Thu Nov 23, 2017 7:04 pm

But have you ever weighed a full reel to see if it is around 1.2kg?
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Postby midlife306 » Thu Nov 23, 2017 7:22 pm

Yep, they've all been 1.2kg
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Postby wibblywobbly » Fri Nov 24, 2017 10:06 am

The good news is that they have offered to refund 2 x 20%, this is the only outfit I have ever bought filament from that only put 800 grams of filament on a reel, lesson learned, it could have been a complete 2 day print disaster. 8O
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Postby silversurfer1947 » Fri Nov 24, 2017 10:11 am

One assumes they will not be getting any more of your business. It is very naughty not stating whether it is gross or net weight.
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Postby wibblywobbly » Fri Nov 24, 2017 10:37 am

Quite, looking at their negative feedback I am not the only one who cottoned on to what they are doing. Most people wouldn't weigh the full reel, I only realised the problem because I was doing a huge print that assumed there was 1kg of filament, I've never done prints this big before. I've just started the rear section of the bodyshell, which will require less than the cab, so will be ok with 800 grams...only 26 hours to go.... :|
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Postby AlwynTurner » Fri Nov 24, 2017 11:08 am

You're a braver man than me with those long prints! I can just imagine 10 hours in and the print comes loose from the bed (and it has happened to me after an hour and a half of a 3 hour print)...... I would be a gibbering wreck by the time the print finishes.

Alwyn :thumbup: :wave:
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Postby wibblywobbly » Fri Nov 24, 2017 11:17 am

I wouldn't have contempated it with my old printers, but this one is just 100% dependable. I just design a part, load it into Cura, adjust the orientation, and print quality etc to how I want it, save the Gcode and print it. I don't even think about sticking parts anymore. :thumbup:
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Postby wibblywobbly » Mon Nov 27, 2017 3:13 pm

Just a few mouldings to print and glue on, but 95% done, and even hooked up six led's that work. One thing I did notice was that although I have a big bag of led's they weren't all the same brightness, so I had to keep swapping them out till I got six the same. There is an led socket on the esc, but it puts out 5.7v, so I ran the power through a voltage regulator adjusted to 3v output and hooked the led loom up to that.

Sorry it's a short video, the blooming battery went dead after 60 seconds...grrr!

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Postby AlwynTurner » Mon Nov 27, 2017 3:31 pm

Awesome work as usual Rob! :clap: :clap: :clap: You should contact NASA about designing and building their prototypes. :D

Next job is an Ares Mars lander/return vehicle and a couple of Habs, then you could do your own Marian sets/movies.

Great job :clap: It gives me hope that with my new printer all my printing problems will be behind me. ;D

Alwyn :thumbup: :wave:
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