We recently posted a guide on modifying your Budaschnozzle 1.1-1.3 into the Polyschnozzle for use with printing at higher temps for Polycarbonate and other materials. You can find the link here: https://www.lulzbot.com/support/converting-your-budaschnozzle-polyschnozzle
For posterity, want to leave an update here that with the introduction of the LulzBot Hexagon all metal hot end, this Polyschnozzle modification is no longer the recommended polycarbonate hot end.
Instead, you can buy a fully assembled tool head with the LulzBot Hexagon hot end for the TAZ: https://www.lulzbot.com/products/lulzbot-taz-single-extruder-tool-head-v2 and the Mini: https://www.lulzbot.com/products/lulzbot-mini-tool-head
We are developing the hot end as a separate, stand-alone product for RepRap and DIY printers as well, so keep an eye out for that! You can sign up for updates here: https://phplist.alephobjects.com/lists/?p=subscribe&id=2