Halloween Spider Box

A Halloween creation : a box which contains a jumping spider revealed by a turning crank. With free video tutorial and pro building instructions.


Direct purchase of the instructions

Halloween Spider Box
5,00  -Excl. Tax
A LEGO Technic Halloween creation : a box which contains a jumping spider revealed by a turning crank. A perfect prank for Halloween !

Lego Technic Halloween Spider Box step by step  PDF instruction. Rebrickable partlist (267 parts). Preview of the instructions at the end of the article. Presentation Video + Free tutorial (YouTube). 


This Halloween creation is a simple creation, but, compared to my previous Halloween creation, I would like to go further with an interactive creation. After making some research about scary things, like clown or Lego set price, I have found the “jack in the box“. This idea was perfect for Halloween. At first I wanted to build a scary clown, but it was to hard with Lego Technic parts, so I have chosen a easy subject : a spider.


Regarding the functioning, the spider is mounted on a linkage mechanism with two springs. These springs are built in a way to be lock on the downer position, but start to push as soon as the system is triggered. The trigger is made with a rotating lever connected to the crank which pushes the parallelogram. The openable top part of the box is also spring loaded to help to open it and keep in open position.


I use some trick to have a correct functioning. The mechanism is equipped with two rubber parts to absorb the shock on the endstop. The top openable part is equipped with rolling parts, in order to reduce the friction to open the box. The trigger lever can rotate in both directions without endstop. It helps to not know when the spider will jump. It is also equipped with friction gear in order that the user can not feel when the trigger is operated.


It contributes to have a spider that surprises, in that way we do not know when it will jump. So if someone comes to your house to ask for candy, ask him to just turn the crank of this box before…

Pictures and Video

Purchasing the creations or the instructions

You can purchase either the whole creation on the website Buildamoc including the Lego genuine parts and building instructions in PDF, or just the building instructions on nico71.fr (see below)

buildamoclogoWant to buy this creation ? The Halloween Spider Box has been indexed to Buildamoc and is for sale. The whole package included the Lego genuine parts and the Pro rendering PDF building instructions.

Building Instructions



As the creation is pretty simple, I do not want to only make a pro-building instructions for sale. So I have experimented a new video format. I have made a free tutorial video (see above) and the pro-building instructions which is for sale. Both way enables to build the Halloween spider box, but if you want to follow an easier document created in a same way as the official Lego instructions, I recommend to buy the pro-building instructions. It is for instance a perfect build for Lego fan or children for the upcoming Halloween.

The instructions are step by step high resolution computer generated instructions with partlist, flexible parts, white edge on dark parts, highlighted parts for each step (you can see preview in the galley below). The picturing bill of material is visible in the instruction previews and includes in the instructions. You can also checked it on rebrickable :

Want to know if you can build the Halloween Spide Box ? The model has been indexed to rebrickable, check it ! (my 100th moc on rebrickable !)

You can buy the instructions with the following button for 6€ (including 20% VAT). You can also buy other building instructions and get an automated discount, 15% off for 2 PDF, and 20% off for 3 PDF on the total). The automated discount is available for all the instructions for sale on nico71.fr.

Halloween Spider Box (Instructions)

Halloween Spider Box
5,00  -Excl. Tax
A LEGO Technic Halloween creation : a box which contains a jumping spider revealed by a turning crank. A perfect prank for Halloween !

After your payment, you will be redirected to a page for downloading your instructions, and will receive also the link to download by email. Please check the spam box and be patient to receive it. If you have trouble to download your copy of the PDF after payment or open the document, do not make a paypal dispute, please check your purchase history or contact me using the contact form. The link to download the instructions expires within 24h. Contact me if you have lost your instructions. Note that you can print it, but not copy or distribute. Thank you for supporting my work 🙂

Here is some preview of the building instructions :

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