If I print at 0.3mm, the hole is too small. But only if I print it at 0.2mm layer height.
I also use Slic3r and if I make a hole diameter 3.05mm it prints a hole that makes a tight fit with 2.85mm filament. Most people care about print quality, not reprapability, so things just naturally went in that direction. You get to see more non-reprapable parts with tighter tolerances like lasercut sheet material, aluminium extrusions, custom machined hotends etc. As focus shifted towards just buying kits or premade printers from online stores instead of sourcing things yourself, so did the designs. What made it gather momentum initially was its open hardware aspect, with designs that let any DIY-er build their own printer using cheap hardware store parts. The idea behind the RepRap project was never that realistic - you obviously can't print stuff like motors, stepper drivers and control electronics to an acceptable quality level. It is typically an XY problem, but i mentioned previously that i've decoupled the XY motion, meaning that the nut is free to move around on XY, but not Z. The easiest way to spot this stuff is to see if the wavy pattern matches the screw's thread pitch (it does). I'm pretty sure it's wobble since i've observed how the X-axis twists when doing a fast move. It especially doesn't matter for Z anyway, because leadscrews can't be backdriven. One guy even made a video comparing the holding torque of a stepper that has been taken apart to one that hasn't, and they were virtually identical. They talk a lot about that in the comments, and apparently the torque you lose by taking a stepper apart is negligible. It shows how Prusa Reseach has definitely done their research, because they use the same type of integrated leadscrew steppers, just with an 8mm pitch instead of the 2mm ones i ordered. Even a 0.5 degree tilt on that end translates to a few millimeters offset at the top end. Big mistake! Never use rigid couplings on a 3d printer - due to the way you use a set screw or clamp it down, the act of tightening it always misaligns it very slightly.
This is with the Z-axis supposedly decoupled mind you - the nut was rocking on its X axis in addition to moving around on XY, twisting the x-axis ever so slightly.Īnyway, since the kink is at the very top of the screw, i figured i could use a rigid coupling and just leave the top unconstrained. While it did decrease some of the wobble, the leadscrew had a slight kink which made it move off-center by ~0.2mm, introducing wobble through the flexible beam coupler at the bottom. I actually printed a pair of long bushings out of PLA that fit the dimensions of the leadscrew exactly, leaving it without any play. >filament type, bed & extruder temp, print & fan speed, etc >what programs do you make your own files withīegin with a roll of known brand PLA before moving to more demanding materials. >why do my prints look like shit, visual troubleshooting Still new pasta, feel free to contribute.Īdditive Manufacturing Technologies:3D Printing, Rapid Prototyping, and Direct Digital Manufacturing, Gibson Rosen Stucker