I wanted a powerful rotary tool with a cool design. I couldn't find any design with a poweful enough motor, so I design one for myself.

I tryed a few desing, but after a while I figured out that if I extend the speed controller knob than I have much more freedom in the design.

I use these parts:
Chuck:
https://www.aliexpress.com/item/TONGFENGLH-3-17mm-Electric-motor-shaft-Mini-Chuck-Fixture-Clamp-0-3mm-3-5mm-Small-To/32788214971.html?spm=a2g0s.9042311.0.0.27424c4d0tjsBo

Dremel Accessories:
https://www.aliexpress.com/item/HILDA-92Pcs-Wood-Metal-Engraving-Electric-Rotary-Tool-Accessory-for-Dremel-Bit-Set-1-8-for/32844618741.html?spm=a2g0s.9042311.0.0.27424c4d0tjsBo

Speed controller:
https://www.aliexpress.com/item/Mini-DC-DC-4-5V-35V-5A-90W-PWM-DC-Motor-Speed-Controller-Module-Speed-Regulator/32843923964.html?spm=a2g0s.9042311.0.0.27424c4d0tjsBo

Button:
https://www.aliexpress.com/item/Mini-Red-and-Green-12mm-Self-Return-Momentary-or-self-locking-Touch-On-Off-Switch-2/32801648671.html?spm=a2g0s.9042311.0.0.27424c4d0tjsBo

Power supply:
https://www.aliexpress.com/item/AC-to-DC-adapter-Switching-16V-2A-Power-Supply-Adapter-Converter-DC-16V-2A-2000mA-EU/32862950920.html?spm=a2g0s.9042311.0.0.27424c4dXzwfsc

Motor:
https://www.ebay.com/itm/253324435343?ul_noapp=true