Spiky Roller Fidget - Spins with High Speed Bearings

This project requires 3D printed parts, tooling, and hardware. Below are links to everything you may need to buy, as well as instructions.

Amazon Purchases

Soldering Iron Station - $39.99 - https://a.co/d/08u09jfh

Heat Set Insert Tooling - $5.99 - https://a.co/d/0gq4YcHq

M3 Threaded Insert - $9.99 - https://a.co/d/05WtQYZG

M3 x 12 screw - $6.99 - https://a.co/d/01sWSxR5

M2 Hex Key - $9.99 - https://a.co/d/054LNsZQ

Loctite - $7.55 - https://a.co/d/0eU0hWl4

Bearings - $6.99 - https://a.co/d/0deOZKdF

Keychain Clip - $5.99 - https://a.co/d/0cE37ZcR

Wrist Strap - $7.89 - https://a.co/d/0h5DQetP

Step 1 Prep the Tooling

1. Disassemble the tip of the soldering pen.

2. Slide the adapter from the 'heat set insert tooling' onto the white cylinder of the soldering pen.

3. Screw stainless steel housing onto soldering pen.

4. Screw m3 attachment from the 'heat set insert tooling' onto the tip.

5. Turn the soldering station on and set to 215C or 420F.

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Step 2 Inserting the Press Fit Insert

1. Rest the threaded insert on the 3D printed 'bottom piece'.

2. Gently press down with the soldering pen until the threaded insert is fully seated and sitting flush with the surface of the 'bot

   tom piece'.

3. Turn the soldering station off.

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Step 3 Assembly Part 1

1. Slide the first bearing all the way down the shaft of the 3D printed 'bottom piece'. 

2. Slide the 'spiky bit' down the shaft until it seats on the bearing at the bottom.

3. Add a second bearing into the instep of the 'spikey bit'. 

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NOTE 1: The fidget works best when the screw that connects the 'top piece' to the 'bottom piece' is very lightly tightened. As you over tighten, the bearing spins less smoothly. 

NOTE 2: Frequent spinning causes the screw that holds the fidget together to loosen, so a droplet of Loctite is used to permanently assemble the fidget. Get comfortable with the assembly process and test the spinning before adding the Loctite, as instructed below.

Step 4 Assembly Part 2

1. Insert the M3 screw through the 'top piece' and use the M2 hex key to thread the screw into the press fit insert of the 'bottom piece'.

2. Adjust tension until the bearings are optimally spinning.

3. Once comfortable with the assembly process and required tightness for best spinning, remove the 'top piece' and screw.

4. Add a small droplet of Loctite to the top of the press fit insert and re-assemble the fidget.

5. Test and adjust for spinning before Loctite permanently sets up

6. Let it sit upright for an hour for the Loctite to set.

NOTE 3: Be careful not to get any Loctite onto the bearing. This will reduce spinning smoothness and speed. A very small drop of Loctite will suffice.

Step 5 Adding Keychain / Wristband 

1. Once the Loctite has set, attach a keychain clip onto the bottom of the fidget.

2. Add a wrist strap for easy carrying.

3. ENJOY!!!