Motorised rotatable filter holder

====== Parts ======
- Neodymium magnets (6 mm x 2 mm) https://www.amazon.co.uk/gp/product/B003MWC1CS
- V slot bearing wheels https://www.amazon.co.uk/Printer-V-slots-Plastic-Bearings-Passive/dp/B078M8VG48
- M3 blots
- M3 nuts
- M5 bolts (3x)
- M5 washers (6x)
- M5 nuts (3x)
- Neutral density (ND) filter NE05B https://www.thorlabs.com/thorproduct.cfm?partnumber=NE05B
- Polariser filter (LPVISE2X2) https://www.thorlabs.com/thorproduct.cfm?partnumber=LPVISE2X2
Electronics
- Stepper motor (SM-17HS4023) https://www.amazon.co.uk/Usongshine-Titanium-Extruder-Printing-17HS4023/dp/B07L8CGQMB
- Arduino nano
- A4988 stepper driver
- 100uF electrolytic capacitor
- 2.1mm x 5.5mm Round Panel Mount Female Socket DC Connector. https://www.ebay.co.uk/itm/252080051894
- 12V DC power supply e.g. https://www.amazon.co.uk/TMEZON-100-240V-Converter-Security-Accessory/dp/B01FYPR5PS