Well, so much for that PEI print bed!
I was getting progressively weirder leveling on the last couple of prints I ran on my Monoprice Select Mini V2…
The original BuildTak clone sticker on the build plate failed, and actually managed to kill a nozzle when it did by snagging on it, so it was subsequently YEETed into the nearest trash receptacle and replaced with a PEI sheet. Now, that PEI sheet I got came with a big sheet of 3M 468MP adhesive transfer film which I used to apply it to the bed after cleaning it up and scraping off some stubborn bits of the stock sticker… You can see the PEI sheet here after it’d been sanded a few times to improve adhesion with some regrettable no name eBay PLA filament.
The blower and fan duct are the result of the stock fan proving inadequate.
It worked great until I found a print I ran today twisted up like a funhouse mirror, the adhesive under the build plate all bubbled and torn, and the PEI raised up and warped on one side as if it tried to rise like dough.
And suddenly it dawned on me, like every time I see someone’s photos of their printer on the Facebook group, they have binder clips on the edge of the glass or PEI bed. Oh gee, I wonder why, could it be that this method of fastening it Just Works without any complications whatsoever (as long as you don’t place them where they obstruct moving parts and, thus, find themselves YOTE into space?)
Yeah. Worked perfectly, though I think I might do it with four clips next time to avoid the PEI sheet lifting and warping the print (not sure if it’s actually doing this — the first layer showed no signs of leveling issues, so it may just be perfectly fine).
Speaking of Monoprice printers…. My Mini Delta decided to inexplicably spring back to life when given a very old SD card with the Marlin firmware build! I was about to rewire the whole thing to a RAMPS board, but now the stock controller came back. Flippin’ weird.
I now have an Anycubic Kossel Linear Plus that’s waiting for me to figure out how the heck to set the delta parameters on as well.
What craziness is all this??!!
Addendum: it takes a lot of clips. A LOT.