Then lower the other side, and center the panel on the printer. The shrinking tube pieces can be pulled out fairly easily if all went well. If it resists; don’t pull harder (that will make it worse), but raise the panel just a little bit on that side, and then take it out.
The metal sidepanels are fairly heavy, which makes it a bit more of a challenge to get all those bolts aligned with the holes. I did it as follows. The side of the printer you’re working on should be up. Take 4 objects that are roughly 50mm (or 2 inches) and put those on the corners of the printer. Put the sidepanels on top of that so the sidepanel is about 50mm above the printer, making sure the holes in the sidepanel are not blocked (look through them, you should be able to see the bolts through the holes). Take some shrinking tube that *just* fits over the M3 threads. (It was labelled 3mm in my case, but un-shrunk it was slightly larger than that). Make as many pieces as there are holes, each about 50mm / 2” longer than the 4 objects you used. Insert the tubes through the holes, and over the threads of the bolt that go there. I squeezed them into the extrusion. Now lower the panel on one side slowly, the shrinking tubes will guide the bolts into the holes. They might need some wiggling.
For 713maker’s metal sidepanels (1/4” thick) and bottom panel; make sure the nut driver outside diameter is less than 9mm. Preferably 8mm even (one row was milled wrong, and the holes there were smaller than the other ones. 8mm barely fit).
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