Improved on the original design from redfoxdude on Printables. Inspired by other similar mods, I've made the mechanism smoother and easier to operate with a lateral tab to put your finger in while spinning.

Bill Of Material

• 4 x 623ZZ (3mm ID x 10mm OD x 4mm thickness) ball bearings uxcell 623ZZ Deep Groove Ball Bearing Double Shield 623-2Z 80023, 3mm x 10mm x 4mm Chrome Steel Bearings (Pack of 10): Amazon.com: Industrial & Scientific
• 4 x M3 x 5mm heatset inserts
• 4 x M3 x 8mm button-head screws
• 50 x 5mm ball-bearing steel balls TA-VIGOR 100pcs 5mm Bearing Balls, Solid 304 Stainless Steel Ball G100 Precision Balls for Equipment Repairing/Bearing Balls/DIY Projects: Amazon.com: Industrial & Scientific
• 10 x 0.35x75mm acupuncture needles ZHONGYAN TAIHE 500 pezzi ago per agopuntura con tubo spedizione gratuita tutte le dimensioni agopuntura ago per massaggio di bellezza Sterile monouso - AliExpress
• medium strenght thread locker Amazon.com: Blue Thread Locker 242 Medium Strength Removable 1.69 Fl oz/50 ml Nuts & Bolts Locker Threadlocker Lock Tight & Seal Fasteners Anaerobic Curing Metal Glue (242) : Automotive

How to Assemble

• Press the ball bearings in place on the Spin ring, you can help yourself lightly tapping them in place with a hammer.

• Press the heat inserts in place in the lower gear mechanism.
• Place all 50 steel balls in place on the mechanism.

• Put the Spin ring over the mechanism and allign the screw holes.
• Screw all the button-head screws in place as tight as they go. You will notice that the mechanism is hard to rotate now.
• Back out every screw by a quarter turn and check on the smoothness of the rotation. Repeat this step until the upper part spins quite smooth and keep track of how many times you unscrewed everything.
• Once at a time, take out every screw, use a dot of threadlocker to screw them back in place and back them out the amount of turns that you did before.
• Take the acupuncture needles and cut them with the provided tool, 5 for each lenght (55mm and 45mm)

• Give the needle handles a slight bend

• insert them in place like the image below. The 55mm ones goes in the green dots, the shorter ones (45mm) in the purple dots.

• screw in place the base that you choose for your specific basket depth. You can find it on the original design post on Printables Umikot (58mm Version) - Planetary Gear Spirograph Espresso WDT Tool by redfoxdude | Download free STL model | Printables.com