I made this simple cutting jig for silicone tubes to get the perfect 19mm length and cross section cuts for my Ultimate Nozzle Wiper. The gaps are big enough to use a knife with a maximal blade thickness of 0.7mm. STEP file is included in case you want to do a remix. Happy printing!
Ultimate Nozzle Wiper: https://makerworld.com/en/models/93701
You need a Quality Silicone Tube (200-300°C)
You can find the silicone tube on amazon or if you're from germany here: https://schlauch24.de/Silikonschlauch-Meterware-3-mm-x-7-mm
It is also available on aliexpress here: https://de.aliexpress.com/item/32608855966.html
Outer diameter = 7mm
Inner diameter = 3mm