We’d been having some problems with our 3D printer, where at seemingly random moments, it would miss a lot of steps (up to 5mm!) on the X-axis. I suspected that the belt was too loose, which was the case, but when I tried to tighten it, disaster struck:
We were having very good results printing with the black PLA without any extra cooling, but the green PLA that we wanted to use was not so cooperative. PLA tends to stay soft for a little time after extrusion. While this is nice because it lets the printed layers fuse together well, it can also cause the finer details of your prints to warp and sag. One advice commonly found on the Internet says to add a small fan to blow cold air over your print, to make the PLA cool down faster. It seemed worth a try.
So here it is: our RepRap Prusa Mendel iteration 3 in all its glory. It is based on the kit sold by cookinghacks.com; we have started to make a few modifications: