My library has the LulzBot TAZ 6. It looks like they are putting the glue stick right on the heat bed. Is this not suppose to have glass or something over the heatbed?
It has this heat bed: https://www.lulzbot.com/store/parts/lulzbot-taz-heat-bed-kit
I think this part is missing:
LulzBot Taz 6 with single extrude head, nGEN co-polyester filament by colorFabb
Help?
Do you have a picture?
They open in a couple of hours. Do we want a close up of the side view of the bed?
A closeup of one of the corners where the autoleveling takes place would probably be good. Angled so you can see the side as well as the top of the surface.
Now I do see glass on top, it is just so badly pitted. I want to buy them a replacement part. Is it the PEI print surface or PEI print sheet? A link would be great.
You can get the PEI sheet from Amazon.
Disconnect the bed, put it in the freezer for one hour, remove old pei sheet, scrape off old glue with a razor blade and rubbing alcohol. Dry, keep bed lint free as possible, apply new pei sheet, trim edges where necessary, re-assemble, rejoice, start printing.
There are also good instructions (and video) for replacing the PEI sheet here: https://www.lulzbot.com/learn/tutorials/pei-print-surface-maintenance
Is this all I need or do I have to buy the Print surface as well?
Thanks guys. I will just buy the sheet on Amazon from the link provided. I am not allowed to touch the machine. I will buy the sheet and leave it next to the machine. This should make everyone’s experience better.
Yes that is all you should need. The Pei sheet is the print surface adhered to the glass secured to the heater held on by the washers 
. Shame you can’t change it out for them. That adhesive is strong and very messy, it is a bit of a challenge to change out. I understand though and good for you for helping them out with it! 
It is a lot harder to give things away than I thought. I am not allowed to donate officially to my branch.However if it just happens to be sitting next to the printer on Monday morning…
You can replace the PEI sheet. It is also possible to upgrade it to the modular print bed (that’s not the bed it currently has.)
See: https://ohai.lulzbot.com/project/lulzbot-taz-modular-bed-system-installation/
The modular bed is in two parts:
You can flip the glass surface over to print on the glass side or on the PEI side.
PEI can get nicked up and damaged over time when you try to work parts free. It can be sanded smooth again … use a few grits of sandpaper working your way up to around 1500 or even 2000 grit.
It’s a pain to replace a PEI sheet. If you remove the surface and toss in the freezer for a few hours, it comes off easier … but it does leave the 3M adhesive behind and THAT… takes some work (and a LOT of isopropyl alcohol) to clean off. Once cleaned… you can very carefully squeegee on a new sheet of PEI (being careful to work out all the bubbles … going very very slowly).
Glass is a LOT more durable over time. If I were a library… this is what I’d want to use. Many materials don’t adhere well to glass without some help … such as a PVA glue-stick (Elmer’s glue). My favorite is something called Magigoo … sticks about the same as Elmer’s … but it’s incredibly easy to get parts off the plate if you allow the bed to cool completely.
PEI sheets are normally glossy on one side and have a dull matte finish on the other side. LulzBot normally uses PEI with the dull-side up. But a lot of vendors sell it glossy-side up (the 3M adhesive is already attached to one side … so you don’t have a choice. You have to order the sheet setup the way you want to use it.)
Replacing just the PEI surface is a lot cheaper than upgrading the bed to the modular print bed. The new printers include the modular bed system.
Interesting… The upgrade at $250 would be a gift, Perhaps this $20 sheet is just a not so subtle reminder it is time to do a dirty job. This small town library branch is asking a lot of it’s librarians. Is it common for a library to offer free 3D printing?
Thanks, the article is so much more enlightened than our policies. The librarian himself knows the real limitation is time, the machine cannot run after hours. However the rules are Layer Height: 0.25 mm, Filament: nGEN co-polyester filament by colorFabb, Infill default setting: 20%. No doubt an effort to keep time down. I am having to redesign my models to work at this resolution. I would rather pay a little, experiment with materials and gCode settings but still stay in the spirit of the rules with files less than six hours.
