September 30, 2019 at 5:37 pm #116173
1″ OD Steel tubing, printed in PLA and PETg. Hardware purchased here; waiting to tackle dual end stops later. Haven’t gotten around to beautifying the wires yet, though cable chains are printed. 🙂
Crown test prints, with a sharpie on a PETg holder, are all identical — almost there, but the center circle at the top, and the circle on the left, don’t quite match up. I’ve tried with different starting points. I’ve tried printing twice from the same starting point, and it’s identical every time. I’ve tried using Repetier Host on Windows, and Pronterface on Mac. Same results. What’s up?
1 user thanked author for this post.September 30, 2019 at 5:54 pm #116178
I would guess it’s pressing the marker down too hard and the error is in the pen holder. Nice build though. Is that the same cabinet as Ryan?September 30, 2019 at 6:09 pm #116179
Thanks, the stand is slightly different (a Husky — and, since it was on sale, several hundred dollars (!) cheaper. Not sure how I’m going to cover it to cut down on dust & noise once I get to routing, though…)
I’ve actually wondered if it’s the pressure, and might try a ballpoint for comparison. Also just found someone else just had similar issues, so I’ll check my pulleys and stepper motors next.September 30, 2019 at 8:25 pm #116186
Yeah, set your Z0 to the work surface and have it only move down 0.5mm (depth of cut) when drawing. It’ll still move up enough for the clearance plane, but won’t try and push the pen down so hard.October 1, 2019 at 3:15 pm #116277
Replaced the Sharpie with a pen, and got very similar results.
I noticed the zip tie holding the end of the cable on the right had its bulky end facing inwards, so it was pushing the cable out away from the leg — slightly, but it meant the cable wasn’t straight. Also loosened all the bolts for the bushings on the X and Y axes.
The latest try is definitely *much* better, though I’m still not happy with the (not-quite-a) circle at the top center. Am I just looking for too much perfection from the pen? I’ll be using this with a drag knife next, and have plans for a laser after that, so I want to make sure this is actually working properly. If not, what else do I check?
Attachments:October 1, 2019 at 3:24 pm #116283
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