Marshall
Posts: 44
Joined: Sat Jun 20, 2015 8:15 pm

What is your approach to ridding of model bow?

I went through the 3D printing process the hard way; like many. First, I started with my MakerGear M2 printer, armed with white/black PLA and ABS spools. I printed, tweaked, printed, and tweaked some more.

I feel through all of my printing work I have captured the majority of problem-solving techniques to rid them. I went onto ABS after PLA, and felt I had conquered the material I was using. I went back to PLA, feel that I honed in on correct extrusions, multipliers, retract etc--without any nozzle clogging issues (also used spool dust filters since day 1), but I seem to be running into a problem I didn't have before. It may be the specific part. It's basically 70(x)x70(y)x13(z)mm, sort of like a frame profile resembling slice off a cube with a square cut out of its center.

To get to the point, I'm getting perfect bottom layer(s). Perfect top layers. (OK, "really good", you might not call anything perfect ;) ) But, the sides of this part, I can't for the life of me rid the "slim waist" effect. It tapers in after the first 4mm height, then parallel on up. Usually this is seen with too much bottom material, too little bottom layer height. But it isn't that as the bottom layer is laying down text I placed on it very sharply like the CAD model, which is against the bed. I have tried 28% infill, down to 18% infill, the result seems to remain. I use my bed at 75C. Nozzle at 215C. I tried going down to a very slow print speed, as a faster print speed increased the warping. This didn't help. I mean very slow, too. My infill goes, -45°, 0°, 45°, respectively. Black MG PLA, 0.15, and 0.16 layers now.

Anything throwing a red flag in your view? Tried fan on, fan off, too.

Thanks

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