First prints from Tom S. inspired Prusa clone...

First prints from Tom S. inspired Prusa clone…

IT’S ALIVE!!!

I’ve been printing for 5 years using a Replicator 2 and now I’ve upgraded to an Original Prusa i3 MK2S. While waiting for my Prusa kit to arrive I watched every minute of Tom’s 3-D Dolly clone build which inspired me and another person from Workshop 88, A suburban Chicago maker space (http://www.workshop88.com) to make clones. I’ll share the printer in show and tell when I get it dialed in and cleaned up later. It was a lot of work, took a lot of patience to wait for everything to arrive from China, and has required a lot of great troubleshooting, on the fly engineering, and learning.

I just wanted to thank the community here for all the good feedback and advice given to others over the years. As a result of my lurking, I easily can recognize that I have bed height issues (still tuning), missed steps in Y (stepper driver current to low), and under extrusion on the top (probably temp related, haven’t tuned PID yet), but it works! The 1cm calibration cube is dimensionally accurate, and the printer hasn’t caught fire yet (using SSR for bed, soldering power connections to RAMPS 1.4, and replacing poly-fuses with automotive fuses)

Good start. Looks like you’ve identified the big stuff.

Configured speeds and accelerations, loosened y belt, calibrated nozzle and bed PID, added 2 layers of Kapton tape to each top of hotend and bottom of Chinese heatsink, added thermal compound to loose threads inside heatsink, light 3 in 1 oiling of 500mm of filament, added silicone sock to hotend, and calibrated extrusion.

Prints very nicely now without jams.

One problem left is the very slight bands. They are not spiral so are not z wobble but perfectly match the leadscrews thread spacing. I think they are either microstepping artifacts from using imperial threads in z axis (3/8" 16tpi) with .2mm layers or runout in the cheap rolled threads of hardware store threaded rod (I suspect). More tests tonight. missing/deleted image from Google+