--- body
(2x) 608-2RS bearing
(1x) 8mm x 45mm head head bolt
(2x) 8mm washer
(1x) Nema 17 23mm pancake stepper
(2x) 3mm x 10mm socket head screw
(2x) 3mm x 5mm socket head screw

--- tension arms
(2x) 4mm x 25mm phillips screw
(2x) 4mm x 10mm set screw
(2x) 624ZZ bearing: 4mm x 13mm x 5mm

-- tension adjustsers
(2x) 10cm(4") x 2mm(3/32") cable tie
(2x) 4mm x 20mm pan head screw
(4x) 4mm nut
(2x) 0.9mm x 7mm x 25mm spring
 or  0.035" x 5/16" x 1" spring

-- servo selector
(1x) Meus M3280S 8KG servo
     https://www.amazon.com/dp/B0F9XVZGTD
(1x) 3mm x 8mm screw
(1x) 3mm nut
(1x) 3mm washer
(1x) MR92ZZ bearing: 3mm x 9mm x 4mm

--- filament sensor
(1x) 5mm(d) x 4mm(l) set screw
(1x) 0.2mm x 3.5mm x 10mm spring
     https://www.amazon.com/dp/B0CGZNNP1M
(1x) 4mm or 5/32" ball bearing
(1x) 3mm IR LED (black)
(1x) 3mm IR photodiode (clear)
(1x) 150Ω 1/8w resistor
(1x) 10kΩ 1/8w resistor