Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Ghostbusters Ghost Trap (1984)

by countspatula, published

Ghostbusters Ghost Trap (1984) by countspatula Mar 9, 2016


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Cinema 4d

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UPDATES 2/18/18

  • Electro-Mechanics Guide is now available in my shop! 95 page, fully-illustrated guide geared toward the layman to build and install electronics and mechanics.

  • Check out the Sneak Peek PDF for a taste of what the guide is like plus a full list of parts needed: http://bit.ly/Electro_Sneak-Peek

  • Arduino code & SFX files available for free on my site: http://bit.ly/3D_Kit_Instructions

  • Print Guide updated to v10 - indicates which parts need printed for electronics installation
  • Uploaded new version of top frame (regular & dual outlet) with reinforced door supports.

UPDATES 1/26/18

  • Uploaded new versions of GB1 RIGHT side panel parts. Originally I had the resistor centered on the vector plate. After reviewing photos of the movie prop realized it's off-center toward the back of the plate. New versions of RT panel, RT LG aluminum plate and GB1 vector plate uploaded and replaces old versions.

UPDATES 1/23/17

  • Uploaded cut-up versions of side panels and bottom frame for smaller print beds. Print FRONT & REAR and glue together.
  • Added GB1 versions of vector plate and resistor plus matching aluminum plate and side panel as they have different hole arrangements.
  • Renamed some files for organizational purposes - model remains the same
  • Print Guide updated to v9, reflects new parts, corrections and more details.


A complete list of hardware needed for a Standard trap (fully 3D printed) is included in the downloads. You can also get all hardware and Deluxe upgrade parts directly from me: https://charlesworthdynamics.etsy.com

Trap Pedal is also available to print:

Updates via Twitter and Etsy:

This Ghost Trap is over 58 parts designed to be fully 3D printed except for the screws that hold it all together. The trap can also accommodate electronics for lights, sound, door mechanics and smoke. The first two gallery pictures show a Deluxe trap with as much real hardware as possible.

This is a hybrid between the GB1 & GB2 traps - overall size, screw placement and knobs are GB2, the protruding cartridge is GB1. I modeled the trap starting with excellent plans from Sean Bishop and Stefan Otto from www.gbfans.com. From there I made further modifications based on my own research and an abundance of photo reference.

While the trap is fully printable, it was designed based on real parts whenever possible so they can be swapped out as an upgrade. For example, 1/16" aluminum plates can be swapped out by using the 3D printed ones as a template.

To learn more about how the Trap was designed and built, see me on Tested.com:

Print Settings


You will need a print bed that can accommodate up to 8.8" W x 4" D. The original was fully printed on the Dremel Idea Builder. Cut-up versions of some parts have been uploaded for smaller print beds.

All files have been run through mesh repair and are ready to print. They are oriented for optimal print quality.

To help confirm scale, I have uploaded cube_1_inch.stl and cube_20mm.stl. Depending on what system you are using, load one of these cubes with the parts and confirm if it is 1" or 20mm. If so, all the parts should be at proper scale.

I'm not providing print settings since it can vary wildly from printer to printer. Certain parts, such as the handle and handle frame should use a higher infill for strength. Other parts, such as the foster connectors benefit from slower speeds. A hardware list and print guidelines are included in the download.

SPECIAL ULTIMAKER NOTE: The side panels and bottom frame JUST fit on the UM2 print bed. In order to print you have to open Expert Settings > Skirt > Line Count and set it to 0. The part should be placed going left to right and nudged as far left as it will go. It's been recently discovered that due to the new fan shroud on the UM2+ the side panels must be rotated approx 45 degrees and bottom panel can't be printed at all without swapping out fan shroud. See Comments section. Finally, I have also discovered that Cura refuses to print the scribe lines (paint guides) on the top doors. MakerBot Desktop and Simplify3D print them no problem, not sure what's up with Cura - prints fine otherwise.

58+ Pieces

Demo of Deluxe Trap with electronics, door mechanism and smoke.

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I don´t want to be impertinent, I really like the desing and have the biggest respect of the work you had with this trap. But as I like to Change some parts (especially the Mechanik for the doors and Fixing Points for the electric) I would like to ask you if it is possible to get files in another Format? Maybe STEP? Please?

Regards, Peter

Sorry will not be posting source files. They were modeled in Cinema 4D so aren't much different than the STL files.

Comments deleted.

I'm really wanting to do this project, the issue i have is that my bed is a little too small for some parts. I can fit them all if I print it at 90%. My concern is that making it 90% will make sourcing screws difficult. I've seen people do scaled versions before & wondered what others had done. Thanks for any help.

I recently added chopped up versions of the side panels and bottom which may help. Scaling 90% will make the fastener situation difficult. You may want to look at something like MeshMixer which will allow you to chop things up further and then glue them together.

Ok. That's kind of what I was thinking. Thank you for the advice & the quick reply. Cheers

Absolutely fantastic. Just watched Tested and spent the whole time picking my jaw up from the floor.

Thanks! Glad you liked it.

Am I the only one trying to fit a potentiometer under each knob of the trap?
I'm having issues with the front panel ones; Except for one, it seems I'll need to do heavy changes to the front box before I can fit them.
(that's a shame, I managed to source two with the extra thin shaft for the rectangular knobs, and I cannot use them :o( )

Any idea how to manage this? (is there an extra small kind of potentiometers that would fit in there?)
Is it even possible?

Any idea about resolving this issue?

I know I don't need to do that, but I'd like every button to work :o)

Any news for the electronic part?

Official website says "Electronics guide is going to take a while". Are we talking in days? months?
I printed everything and found almost all the hardware, so I'm kind of looking forward to start assembling ;o)

Could we at least get some insights about the doors opening mechanism? (I assume this is the only part that may require some changes during the assembling of the trap).

The guide is in the works. Not possible to give much insight into the door mech without writing the entire guide - no modification is needed, just installation. The Trap can be assembled and the electronics installed afterwards with partial disassembly.

It's good to hear it's still coming :o)
I'll start assembling since there shouldn't be too much changes..

Now the question is: Does it work against ghosts?

Very nice work!

I started to print the trap on a smaller printer (200x200mm printbed). I had to edit a few parts in order to make them fit and I'd be happy to share those alternate versions, but since the license is "share alike" I probably need some authorization first, so... that's me asking :o)

Thanks again for the awsome work you've made countspatula!

Thanks very much.
Simply use the 'Remix It' button at the top and post your files!


I'm looking forward for the electronic part documentation now ;o)

It should probably be noted that those who have upgraded to the Ultimaker 2+ will have to use the original UM2 fan shroud or print one similar (where the fans are 45 degrees instead of lying flat) and they'll also have to adjust the print bed size in their slicer of choice to the original UM2's bed size, as the UM2+ has just enough of a smaller print area that some parts (like the bottom frame) will not fit regardless of orientation.

It's an easy fix. There's lots of alternate fan shrouds for the UM2 available to print that are head-and-shoulders better than the stock one.

Still annoying. Is this true even with the Skirt set to 0?

The issue is the new fan shroud. The original has the fans at an angle while the new one has the fans sitting face-down, taking up more overall area in the XY plane. They had to shrink the X axis down in the build volume or the shroud would butt up against the interior wall of the printer.

It stays true even with the skirt set to zero. The bottom frame cannot lay flat and still fit in the build area for the UM2+ with its normal settings. Using an alternate fan shroud that angles the fans and editing the build volume in the slicer fixes the problem just fine.

So, what's everyone using for door pins? I'm thinking of cannibalizing a coat hanger, myself.

Awesome job, cant wait to finish printing it. Do you think the full side rods should have screw holes in them?

Doh! I accidentally uploaded the pre-booled version. Fixed - uploaded full version with holes.

OK, is it me, or are "bottom frame" & "bottom frame - motor" exactly the same? If I'm wrong, where the heck does the motor mount, er, mount?

Nope, motor version has a bigger hole in the back to allow screw to pass through. When using the motor mount a longer screw is used on the rear axle that goes into the mount and holds it in place. Working on assembly guides which will make it clear.

Thanks for sharing! Also, love the videos. Great stuff.

So cool, thanks for sharing!

It's sweet how the layering of the 3d printer makes it look like its made out of brushed blackened aluminium/steel.

Adds a lot of detail for no extra effort.

As you already know! Fantastic Job, Glad to see you more on tested.

Yea, I saw this on tested and thought it was awesome. I also saw your scuttle fish video and might print it.

As a fellow GBFan and prop modeler, let me just say that this is beautiful work. I cannot wait to get started on this!

just watched this on tested, awesome work.

Truly amazing work! Thank you for sharing!

Hey Sean! I'm a friend of Frank Ippolito and I have a 1:1 Slimer (cast from Steve Johnson's shop molds https://flic.kr/p/zPvEop ). I want to incorporate a trap into the base. I have some plans for electronics, but I would love to know what you did with the e-cigarettes to make the smoke!

I'll be writing an electronics guide soon and have some kits for smoke, doors, etc. Will keep everyone posted.

Nice job... Amazing work!

Hi, does this really catch ghosts?

Only 3D printed ones.