Discuss the upcoming movie to be released in 2020 and directed by Jason Reitman.
By tobycj
#4955989
Bloodvayne wrote: September 23rd, 2021, 7:34 am Any leads on that left front mounted device? I keep google photo browsing Gun/Helmet/Mask/Rail/POV mounted Camera's as the milling on the body comes close to some things I find. And I would like to think Podcast would have a POV view maybe somehow tied into the Goggles while driving the RTV from inside the Ecto.

As far as the flashlight goes. I am still certain it is a helmet mounted light, seeing as though they come from a "mining" town. As I guess you could say the grip bands/milling (not sure of actual lingo) on the flighlight bulb housing are wide for glove usage. But still can't find an accurate representation.

Great progress so far man!
They definitely 3D printed a few things for the props, so entirely possible these are custom designed 3D printed parts. Certainly not seen anyone ID them yet anyway.
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By drsyn71
#4956096
So... I went the el-cheapo and easy route. I used a Spirit Halloween trap and a $20 R/C truck from Wal-Mart. I took the truck top off and the "chrome" exhaust. I left everything else as-is. I popped the wheels off the trap. I cut a crude rectangle hole in the bottom of the trap to go over the R/C units battery pack. I sat the trap down onto the R/C body. I used the existing mounting holes on the R/C body and zip tied the trap to it. I had to drill 4 little holes-2 on each side of the trap and ran the zip ties thru the side, down through the rectangle hole and into the mounting holes on the R/C body. I KNOW it's not canon and looks nothing like the one in the movie, but it was fun, cheap and quick to do. Not to mention I have fun with it out in the road.

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By drsyn71
#4956099
So I added a light. A cheapie LED deal. It was a freebie. It had a Pennzoil logo on it. I covered it with red electrical tape. I hot glue-gunned it to the top corner and made sure the trap doors could open fine. Talk about low-tech. I love it.

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By drsyn71
#4956107
Thanks. I went into Walmart with some measurements of the trap base. I started looking at the the R/C stuff they had and measuring it. I could have went with a bigger, more powerful and more expensive truck, but this one seemed right. Plus I like the wheels and tires. It's a little under-powered for the weight of the trap, but it does OK. I could go and spend a lot of time and effort cutting stuff out in and under the bottom of the trap to take off some weight, but I'm not going to. I like that I can just snip the 4 zip ties, pop the wheels back on the trap and revert back to the old trap minus the R/C body.
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By Grymlock
#4956223
Thanks for all that you've shared thus far Far451! ^_^
My platform arrived in the mail today; I went with 2wd to hopefully simplify the build a bit. The Arrma Voltage has a midship motor and a center mounted steering servo so I think it should do the trick. Gotta shorten the chassis once my Spirit ghost trap arrives in a few days and I can measure it out.

I think I have to replace the esc so I can hook up my own receiver; the installed one is an AIO and I need more channels for all the lights and door servos.

Can't wait to get rolling! ^_^
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By Grymlock
#4956332
Progress on my guy ^_^ Took the Arrma out for a rip; it's fast and stable! Added the big RTV wheels and now even more so. Walmart trap came in so I tossed it on top just for giggles and then set about chopping off 7.5cm off the 28.5cm wheelbase. Waiting for the epoxy to dry and then it's time to start fitting the trap. :-)

I also found this smoke generator specifically for RC cars... for $27 off of eBay, thought I'd give it a shot since it runs directly off of the main batt balance lead and plugs straight into a PWM port on my FrSky receiver.

https://youtu.be/HDk0xQC7Iw0?t=204

I'll let you know how it goes!

Far451, how were you thinking of handling lights and sound? I'm very new to the FX side of things so looking for any pointers on how I can maybe get it running in sequence with a flick of a switch on my transmitter. ^_^
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By Far451
#4956353
I recently moved and am still unpacking, so the progress was slow for a bit.

Nice work Grymloc!

To answer your question about the inner workings, I plan on using a the same smoke setup I used in my ghost traps, Kangertech K2 cartomizer with a small suction motor. ( You can run them on 5v and the smoke is obscene!)
Although you can run things from the remote control, I plan on doing a combo, the remote is the trigger, and the arduino processor takes care of the details. (A Nano is a good size and has lots of ports)
The suction motor should run longer than the cartomizer in order to clear out the tubing, there is a maximum length of time I would run the cartomizer to avoid overheating. In the past I used Neopixel programmable LEDs for the light show, the nice part about that is they are RGB so you can make any colour you'd like.( all with the Arduino in control)

I think the doors will be run by 2 or 4 tiny 9g servos (haven figured that out yet- still waiting for parts). I find the arduino processor can give you very accurate end states for opening or closing (one closes slightly before the other so they don't jam) and can do things like make the doors look like a ghost is pushing them from the inside "bump the doors". It can also run the little MP3 players that I may use.
I'm not sure about the sound yet, since the trap is for outside, getting the right volume could be an issue.

I'm still looking into the light show, a mixture of laser and Neopixel LED is what I've been toying with, and a fan to blow the smoke up and out of the trap. ( The fan has a mirror on it to reflect the laser in a cone shape.) The whole light show is still very much a work in progress, my first 3 attempts were not what I wanted. I'm all ears if anyone has Ideas!

I should have my shop setup this week and I'll be back into it.

Thanks for the update Grymloc! Please keep them coming, all ideas are helpful. :)
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By danimal
#4956600
I started with a 1:12 RC 2wd off amazon due to the needed wheelbase for Spirit and Walmart trap sizing...
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Then added the correct wheel/tire set... I opened the trap and move the electronics out while trimming about an inch off the trap bottoms to get the right stance on the RTV, while still being able to remount and use the electronics.
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By juanitospringer
#4956923
Is it possible to buy or get the trap files from you? I'm CADding up the hubs and tires myself as we have perfect profile pics so it should be a quick thing to crank out as I've designed and printed RC tires and hubs before in TPU and PETG. I suppose I could make molds for them if it comes to that. Definitely want to put an ultrasonic fogger, esp8266 arduino, and a wifi cam in this. So it can be driven over the internet fpv style with the Blynk or some other arduino app. If I could use your files it would save me massive time.
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By Grymlock
#4956990
Welp, more progress :-) Cut the spirit trap up to get it to fit the chassis; not looking too shabby! Using 4.3g emax servos for the doors and hooked up the leds and fog machine. Connected to my Radiomaster TX16s on an 8ch receiver. Got two more channels which I'm going to get a PWM switch for so I can trigger the original lights and sound. Still got a ways to go before final paint. Ooh, need to print out the headlight mount as well. ^_^

https://instagram.com/stories/grymlock1 ... =copy_link
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By Grymlock
#4957246
dav59300 wrote:Grymlock I like your set up and just bought a spirit trap to try the job. Is there any way to see more pictures of your build and the exact model of rc car you bought please ?
*UPDATED PARTS LIST as of 10/19/21*

Hey Dav59300! Thank you so much! My trap's currently drying from the spray paint but once I get it re-assembled, I'll throw up some more pics!

I'm a pretty avid RC drone/fixed wing pilot so I'm approaching this project with that knowledge... The parts below are basically anything that I could plug into the ports on the 8ch receiver and then I use my transmitter to mix and program how they fire off in sequence. I wish I had more coding experience so I could integrate an arduino type setup, but perhaps in the future :-D


Here's my current list of parts that I'm using:

Spirit Ghost Trap (I had ordered both this one and the Walmart one and opted to keep the Walmart one intact even though it was cheaper, since it had the foot pedal functionality). :-D

RC car - Arrma Granite Voltage Mega 2wd (I chose this one because not only is it 2wd so I don't have to muck with a driveshaft, it also has a midship mounted brushed motor. The chassis was very easy to shorten, but the one issue it does have is that it has an AIO esc/receiver combo which makes adding additional channels to drive things like lights/sound/smoke/servos impossible with the included set up. The included steering servo is also a 5-wire setup... I don't know why. I did order a new servo and esc though for a reasonable price and it runs great :-D)
https://smile.amazon.com/ARRMA-RC-Monst ... RydWU&th=1

Hobbywing Quickrun WP 1080 brushed (2-3s) ESC
https://smile.amazon.com/Hobbywing-Elec ... 668&sr=8-3

Zoskay RC servo
https://smile.amazon.com/ZOSKAY-Waterpr ... 96&sr=8-24

VQRTKS 4-pack 12mm to 17mm Wheel Extension Hex Drive Hub Adapter 30mm offset
https://smile.amazon.com/gp/product/B08 ... =UTF8&th=1

2x Goolsky 2Pcs Austar AX-3011 155mm 1/8 Monster Truck Tires
https://smile.amazon.com/gp/product/B06 ... UTF8&psc=1

Frsky 8ch receiver (this pairs with my rc planes/drones transmitter)
https://www.amazon.com/FrSky-Taranis-Co ... 065&sr=8-5

Radiomaster TX16s (I already had this for my other rc aircraft but there are more inexpensive options that I can help you find as well ^_^)
https://www.racedayquads.com/products/r ... 99f2&_ss=r

Kangertech E-smart Clearomizer (5-pack) (I'm new at the smoke machine building so there's probably better options out there? This one seems to work fine though)
https://vaporden.com/collections/tanks/ ... kangertech

Mini airpump 3-5v (these guys are tiny! The flow is only 0.3L/min but the voltage input is 3-5v so it works great for being powered off a 1s lipo battery. )
https://smile.amazon.com/gp/product/B08 ... UTF8&psc=1

ShareGoo 8 leds lights - all white (I used 4 of these for the headlights and the other 4 I placed on the undercarriage to give it some glow. It powers straight off the receiver)
https://smile.amazon.com/gp/product/B07 ... UTF8&psc=1

RC LED Light Bar for RC car
https://smile.amazon.com/Headlight-Comp ... r=8-6&th=1

2x Emax ES9051 4.3g digital mini servo
https://www.racedayquads.com/products/e ... 2c72&_ss=r

Hosim 9125 Battery 2000mah Lipo (I needed a new battery to fit the compartment in the shortened chassis. The included 1800mah NIMH was too long. This lipo battery fits the compartment great with room to spare and actually is a larger capacity. I think I might order a second one and see if two will fit and I can run them in parallel to double the capacity. )
https://smile.amazon.com/gp/product/B07 ... UTF8&psc=1

Miscellaneous bits and bobs - screw caps, 3d printed parts, paint, glycerine for the smoke machine, etc.

Parts I tried and they worked alright but found better solutions:
1/10 RC Car Electronic Simulation Smoking Exhaust Pipe with smoke oil (this worked very well in putting out smoke and hooked right up to my radio receiver. Great as a pre-built, easy to install option, but it's always on at idle and the pump is a little noisy so I opted to build my own)
https://www.ebay.com/itm/174504608388

This is the Arrma granite with the chassis shortened and the new esc, servo, receiver. The new lipo battery sits in the original smaller battery compartment easily. I was even able to preserve the snap shut door :-D
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Last edited by Grymlock on October 19th, 2021, 9:50 am, edited 1 time in total.
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By Grymlock
#4957582
Hey all! Getting closer to complete. ^_^ I ordered some kangertech e-smart clearomizers to try and build a smoke machine and it works great! They work just as well as the pre-built RC exhaust smoke machine, are smaller and waaaay quieter. I just followed along with Kamuicosplays video and it was super simple!

Kamui Cosplay diy smoke machine tutorial
https://www.youtube.com/watch?v=uDISX8MMLak&t=34s

I finished painting and weathering the trap, secured all the wiring, 3d printed the headlights and added some LEDs. I forgot to add resistors though and I burned them out already. :-/ Going to double back and reinstall them, but I think the print might've been a little too big as well so scaling them down to 80% and trying again. I also want to fill the seams and sand it down so they look less janky.

I took it out for a field test and it runs great! Quick but not so fast that it traction rolls or wheelies which is perfect. =) I think the trap is still riding about an inch too high... I'm not sure if I'll go back in and correct that since I'd have to cut away more material. Maybe version 2? :-D

Uploaded a vid to YT and also here are some pics!

RTV field test:
https://youtu.be/njnf_qBAci0

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By Grymlock
#4957691
Re-printed the headlights at 80% scale and they look better! Finalized the leds in them and also added a few just for a bit of undercarriage glow. I was worried I'd have to cut into the trap more to lower the stance but I didn't realize it had a few pre-load spacers installed so I just pulled those off the shocks and bam, got the 1" drop I wanted :-) Feeling pretty good about the build now; gotta finalize some parts like the little antenna thingy and also the connector on the rear. I think I want to print a front plate and knobs to replace the stock face. Took some glamour shots tonight ^_^
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By dav59300
#4957693
Great job as im following the build :) !
Would you mind showing how you attached the light ? Ll you propose a way to got the stl in the future ? Ordered my car and ll work on a wallmart trap here. Crossing fingers with my no skills ;). Also how have you cut the trap to fit the car bottom ? Is it glued inside or attached ?
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By Grymlock
#4957722
dav59300 wrote: October 19th, 2021, 2:27 am Great job as im following the build :) !
Would you mind showing how you attached the light ? Ll you propose a way to got the stl in the future ? Ordered my car and ll work on a wallmart trap here. Crossing fingers with my no skills ;). Also how have you cut the trap to fit the car bottom ? Is it glued inside or attached ?
Thanks man! Just started my day; I'll take a vid with a detailed walk through and some close ups today! ^_^
By Grymlock
#4957774
YouTube vid of a not so quick walkthrough of my current build.... I hope it's somewhat helpful in any way ^_^


A bit of a caveat; I don't know anything about arduino programming or coding of any nature so I approached this build in a more RC hobby mentality. I hope to eventually learn the skills I need to make this way cooler in the future though! ^_^

For the headlight STL files, just pm me and I'll email them to you! I just realized I didn't answer the question on how to attach the headlights to the trap. The 3D print is hollow to run the wires and has a channel along the inside of the portion that extends out of the cylinder. I drilled a hole in the side of the trap to just pass the wires through back into the trap. ^_^

Here's a close up of my messy cuts on the bottom of the trap. I basically went crazy with a dremel :-D
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Last edited by Kingpin on October 22nd, 2021, 3:19 pm, edited 1 time in total.Reason: Added YouTube code
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By Far451
#4957873
Great work Grymlock! I enjoyed the Youtube Video as well.

I've been busy the last month, but have unpacked and am starting to look at this project again. I think I figured out the Front flashlight dimensions and with the new 3d printer, they look pretty good.

I'm still waiting on parts for the doors, so I will get working on the insides I guess...
Here is the progress:

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this is from the new trailer: I do notice that the shocks need to move out a bit further from the body, thankfully those are 3d printed parts.
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By Grymlock
#4957875
Woo! Far451 is back :-D Thanks so much!!

Looking good man! Your flashlights are on point! ^_^ Did you make your own led array or pull one from a flashlight? It matches up perfectly!
By dav59300
#4958099
Grymlock wrote: October 18th, 2021, 1:31 am Hey all! Getting closer to complete. ^_^ I ordered some kangertech e-smart clearomizers to try and build a smoke machine and it works great! They work just as well as the pre-built RC exhaust smoke machine, are smaller and waaaay quieter. I just followed along with Kamuicosplays video and it was super simple!

Kamui Cosplay diy smoke machine tutorial
https://www.youtube.com/watch?v=uDISX8MMLak&t=34s

I finished painting and weathering the trap, secured all the wiring, 3d printed the headlights and added some LEDs. I forgot to add resistors though and I burned them out already. :-/ Going to double back and reinstall them, but I think the print might've been a little too big as well so scaling them down to 80% and trying again. I also want to fill the seams and sand it down so they look less janky.

I took it out for a field test and it runs great! Quick but not so fast that it traction rolls or wheelies which is perfect. =) I think the trap is still riding about an inch too high... I'm not sure if I'll go back in and correct that since I'd have to cut away more material. Maybe version 2? :-D

Uploaded a vid to YT and also here are some pics!

RTV field test:
https://youtu.be/njnf_qBAci0

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I sent you à pm ;) ! Can I ask too how you attached your tra to the car ? I m à bit lost on that part :)
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By Grymlock
#4958102
Hey Dav59300! =) Oof, I went looking for my PMs and not sure where to find them. I'll go look again later today! But I'll answer your question here too. So my current fastening system leaves much to be desired but is effective at least. I picked up some black rubberbands from Amazon:

https://smile.amazon.com/gp/product/B01 ... UTF8&psc=1

and am using them to hold the trap to the chassis. Here's some pics to illustrate =) Sorry so dirty, I've been driving it around a bunch ^_^
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This one, I'm going to make an attachment hook on the interior of the trap so I'm not just wrapping it around the outside. Should look similar to the front of the trap.
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As for what the trap is resting on in the chassis, the stock body arms do that job just fine. I pulled the pins that hold them to the chassis, reversed them, snipped the pegs off, and then reinstalled the front one to its lowest position. The rear one, Ieft the pin out and just pushed it down til it stopped and it should friction fit and not move just fine. =)

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I'd like to 3d print something that is a bit more permanent and now that I have a better idea on the fitment of a Spirit/Walmart trap, I'm going to pull apart a second one and start making precise measurements on where we should cut it and design some interior attachment points for everything. I gotta go order myself another trap! :-D
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By Far451
#4958702
After a few different ideas, to get the right look, I managed to find something that appears to be right for the door lever fasteners. They are silver on the new trap designs.

Not sure what their inside looks like, but I opted for a single servo for each door. The parts are for R/C planes and available at hobby shops. The flexible lines make it easier to run the lines on the side of the trap, rather than having 4 little servos right under the front and back of the doors.
Here is a video of the door working:
Last edited by Kingpin on October 31st, 2021, 2:31 pm, edited 1 time in total.Reason: Added YouTube code
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By Grymlock
#4959022
Hope you all had a wonderful Halloween! ^_^ I had some fun handing out candy with the RTV and the kids got a huge kick out of it =) The RTV survived the mob fairly well too with just a snafu with the last group that came through where an overzealous toddler tried to close the doors when it was open and snapped a servo arm straight in half. I then regretted my decision to glue the two halves of the trap together but luckily I had only hot glued the servos in so they weren't too hard to remove and replace the arm. ^_^

Good as new again and I think I'm just about ready to call this guy done. I just need to take one last look at the shocks as the overall added mass of all the electronics and trap are causing it to bottom out more and bounce through cornering so I think I need to just replace the oil with some heavier weight.

Here's some Halloween pics and vids ^_^

Candy dropping RTV and beachwear Ghostbusters outfit:
https://twitter.com/EdricYamamoto/statu ... 70402?s=20

Candy dropping RTV on a foggy night:
https://twitter.com/EdricYamamoto/statu ... 12452?s=20

RTV racing off into the sunset
https://twitter.com/EdricYamamoto/statu ... 48103?s=20

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