This Polyimide (also known as Kapton) Tape is a high temperature insulative tape. It uses a silicon based adhesive to withstand high temperatures up to 260 C.

This Polyimide (also known as Kapton) Tape is extra wide (100mm), great for covering your build platform when printing with ABS. The roll is approx 33m long and Kapton is approx 0.02mm thick

This Polyimide (also known as Kapton) Tape is great for covering your build platform or providing electrical insultation. ABS stick to this when hot (with a heated bed), but releases easily when cold.

This Polyimide (also known as Kapton) Tape is extra wide (200mm)
The roll is approx 33m long and kapton is approx 0.02mm thick

Use this for sensing the temperature of your hot end, heated bed or whatever you can think of

This blue painters (masking) tape is widely accepted as the standard for covering your bed for printing with PLA.
One roll will completely re-cover a Replicator bed over 50 times, or a prusa bed over 43 times.
Genuine 3M Edge-Lock tape

This 1 inch wide ceramic tape is used to wrap your heater block and reduce heat transfer to both the extruder and your work piece. Fix by wrapping in kapton tape.
The tape on your Reprap will need replacing from time to time, especially when a print fails and the melted plastic gets caught up in the print head - it can sometimes stick to the ceramic tape and rip it on removal - careful not to pull on the temperature sensor wire!